diff --git a/src/Mods/Element/Common/BaseElement.php b/src/Mods/Element/Common/BaseElement.php
index 54e2378..ece9ec7 100644
--- a/src/Mods/Element/Common/BaseElement.php
+++ b/src/Mods/Element/Common/BaseElement.php
@@ -41,7 +41,7 @@ public function __construct(\SimpleXMLElement $xml)
     }
 
     /**
-     * Get the text value of element
+     * Get the text value of element.
      *
      * @access public
      *
@@ -53,7 +53,13 @@ public function getValue(): string
     }
 
     /**
-     * Get the string value of attribute
+     * Get the string value of attribute.
+     *
+     * @access public
+     *
+     * @param string $attribute name
+     *
+     * @return string
      */
     protected function getStringAttribute($attribute): string
     {
@@ -66,4 +72,25 @@ protected function getStringAttribute($attribute): string
         }
         return '';
     }
+
+    /**
+     * Get the int value of attribute.
+     *
+     * @access public
+     *
+     * @param string $attribute name
+     *
+     * @return int
+     */
+    protected function getIntAttribute($attribute): int
+    {
+        if ($this->xml->attributes() != null) {
+            $value = $this->xml->attributes()->$attribute;
+
+            if (!empty($value)) {
+                return (int) $value;
+            }
+        }
+        return 0;
+    }
 }
\ No newline at end of file
diff --git a/src/Mods/Element/Part.php b/src/Mods/Element/Part.php
index 7cc328c..65d4382 100644
--- a/src/Mods/Element/Part.php
+++ b/src/Mods/Element/Part.php
@@ -90,12 +90,7 @@ public function getType(): string
      */
     public function getOrder(): int
     {
-        $value = $this->xml->attributes()->order;
-
-        if (!empty($value)) {
-            return (int) $value;
-        }
-        return 0;
+        return $this->getIntAttribute('order');
     }
 
     /**
diff --git a/src/Mods/Element/Specific/Part/Detail.php b/src/Mods/Element/Specific/Part/Detail.php
index ed45f99..60dc489 100644
--- a/src/Mods/Element/Specific/Part/Detail.php
+++ b/src/Mods/Element/Specific/Part/Detail.php
@@ -76,12 +76,7 @@ public function getType(): string
      */
     public function getLevel(): int
     {
-        $value = $this->xml->attributes()->level;
-
-        if (!empty($value)) {
-            return (int) $value;
-        }
-        return 0;
+        return $this->getIntAttribute('level');
     }
 
     /**
diff --git a/src/Mods/Element/Specific/Subject/HierarchicalGeographic.php b/src/Mods/Element/Specific/Subject/HierarchicalGeographic.php
index 4ad421e..3e77528 100644
--- a/src/Mods/Element/Specific/Subject/HierarchicalGeographic.php
+++ b/src/Mods/Element/Specific/Subject/HierarchicalGeographic.php
@@ -14,11 +14,13 @@
 
 use Slub\Mods\Attribute\Common\AuthorityAttribute;
 use Slub\Mods\Element\Common\BaseElement;
-use Slub\Mods\Element\Specific\Subject\HierarchicalGeographic\Element;
+use Slub\Mods\Element\Specific\Subject\HierarchicalGeographic\LevelPeriodElement;
 use Slub\Mods\Element\Specific\Subject\HierarchicalGeographic\TypeElement;
+use Slub\Mods\Element\Xml\Element;
 
 /**
  * HierarchicalGeographic MODS metadata element class for the 'php-mods-reader' library.
+ * @see https://www.loc.gov/standards/mods/userguide/subject.html#hierarchicalgeographic
  *
  * @access public
  */
@@ -26,72 +28,6 @@ class HierarchicalGeographic extends BaseElement
 {
     use AuthorityAttribute;
 
-    /**
-     * @access private
-     * @var Element
-     */
-    private Element $continent;
-
-    /**
-     * @access private
-     * @var Element
-     */
-    private Element $country;
-
-    /**
-     * @access private
-     * @var TypeElement
-     */
-    private TypeElement $region;
-
-    /**
-     * @access private
-     * @var TypeElement
-     */
-    private TypeElement $state;
-
-    /**
-     * @access private
-     * @var Element
-     */
-    private Element $territory;
-
-    /**
-     * @access private
-     * @var Element
-     */
-    private Element $county;
-
-    /**
-     * @access private
-     * @var Element
-     */
-    private Element $city;
-
-    /**
-     * @access private
-     * @var TypeElement
-     */
-    private TypeElement $citySection;
-
-    /**
-     * @access private
-     * @var Element
-     */
-    private Element $island;
-
-    /**
-     * @access private
-     * @var TypeElement
-     */
-    private TypeElement $area;
-
-    /**
-     * @access private
-     * @var Element
-     */
-    private Element $extraterrestrialArea;
-
     /**
      * This extracts the essential MODS metadata from XML
      *
@@ -107,134 +43,255 @@ public function __construct(\SimpleXMLElement $xml)
     }
 
     /**
-     * Get the value of continent
+     * Get the the array of the <continent> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#continent
      *
      * @access public
      *
-     * @return Element
+     * @param string $query The XPath query for metadata search
+     *
+     * @return LevelPeriodElement[]
      */
-    public function getContinent(): Element
+    public function getContinents(string $query = ''): array
     {
-        return $this->continent;
+        $continents = [];
+        $xpath = './mods:continent' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $continents[] = new LevelPeriodElement($value);
+            }
+        }
+        return $continents;
     }
 
     /**
-     * Get the value of country
+     * Get the the array of the <country> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#country
      *
      * @access public
      *
-     * @return Element
+     * @param string $query The XPath query for metadata search
+     *
+     * @return LevelPeriodElement[]
      */
-    public function getCountry(): Element
+    public function getCountries(string $query = ''): array
     {
-        return $this->country;
+        $countries = [];
+        $xpath = './mods:country' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $countries[] = new LevelPeriodElement($value);
+            }
+        }
+        return $countries;
     }
 
     /**
-     * Get the value of region
+     * Get the the array of the <region> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#region
      *
      * @access public
      *
-     * @return TypeElement
+     * @param string $query The XPath query for metadata search
+     *
+     * @return TypeElement[]
      */
-    public function getRegion(): TypeElement
+    public function getRegions(string $query = ''): array
     {
-        return $this->region;
+        $regions = [];
+        $xpath = './mods:region' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $regions[] = new TypeElement($value, 'regionType');
+            }
+        }
+        return $regions;
     }
 
     /**
-     * Get the value of state
+     * Get the the array of the <state> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#state
      *
      * @access public
      *
-     * @return TypeElement
+     * @param string $query The XPath query for metadata search
+     *
+     * @return TypeElement[]
      */
-    public function getState(): TypeElement
+    public function getStates(string $query = ''): array
     {
-        return $this->state;
+        $states = [];
+        $xpath = './mods:state' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $states[] = new TypeElement($value, 'stateType');
+            }
+        }
+        return $states;
     }
 
     /**
-     * Get the value of territory
+     * Get the the array of the <territory> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#territory
      *
      * @access public
      *
-     * @return Element
+     * @param string $query The XPath query for metadata search
+     *
+     * @return LevelPeriodElement[]
      */
-    public function getTerritory(): Element
+    public function getTerritories(string $query = ''): array
     {
-        return $this->territory;
+        $territories = [];
+        $xpath = './mods:territory' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $territories[] = new LevelPeriodElement($value);
+            }
+        }
+        return $territories;
     }
 
     /**
-     * Get the value of county
+     * Get the the array of the <county> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#county
      *
      * @access public
      *
-     * @return Element
+     * @param string $query The XPath query for metadata search
+     *
+     * @return LevelPeriodElement[]
      */
-    public function getCounty(): Element
+    public function getCounties(string $query = ''): array
     {
-        return $this->county;
+        $counties = [];
+        $xpath = './mods:county' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $counties[] = new LevelPeriodElement($value);
+            }
+        }
+        return $counties;
     }
 
     /**
-     * Get the value of city
+     * Get the the array of the <city> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#city
      *
      * @access public
      *
-     * @return Element
+     * @param string $query The XPath query for metadata search
+     *
+     * @return LevelPeriodElement[]
      */
-    public function getCity(): Element
+    public function getCities(string $query = ''): array
     {
-        return $this->city;
+        $cities = [];
+        $xpath = './mods:city' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $cities[] = new LevelPeriodElement($value);
+            }
+        }
+        return $cities;
     }
 
     /**
-     * Get the value of citySection
+     * Get the the array of the <citySection> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#citysection
      *
      * @access public
      *
-     * @return TypeElement
+     * @param string $query The XPath query for metadata search
+     *
+     * @return TypeElement[]
      */
-    public function getCitySection(): TypeElement
+    public function getCitySections(string $query = ''): array
     {
-        return $this->citySection;
+        $sections = [];
+        $xpath = './mods:citySection' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $sections[] = new TypeElement($value, 'citySectionType');
+            }
+        }
+        return $sections;
     }
 
     /**
-     * Get the value of island
+     * Get the the array of the <island> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#island
      *
      * @access public
      *
-     * @return Element
+     * @param string $query The XPath query for metadata search
+     *
+     * @return LevelPeriodElement[]
      */
-    public function getIsland(): Element
+    public function getIslands(string $query = ''): array
     {
-        return $this->island;
+        $islands = [];
+        $xpath = './mods:island' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $islands[] = new LevelPeriodElement($value);
+            }
+        }
+        return $islands;
     }
 
     /**
-     * Get the value of area
+     * Get the the array of the <area> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#area
      *
      * @access public
      *
-     * @return TypeElement
+     * @param string $query The XPath query for metadata search
+     *
+     * @return TypeElement[]
      */
-    public function getArea(): TypeElement
+    public function getAreas(string $query = ''): array
     {
-        return $this->area;
+        $areas = [];
+        $xpath = './mods:area' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $areas[] = new TypeElement($value, 'areaType');
+            }
+        }
+        return $areas;
     }
 
     /**
-     * Get the value of extraterrestrialArea
+     * Get the the array of the <extraterrestrialArea> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#extraterrestrialarea
      *
      * @access public
      *
-     * @return Element
+     * @param string $query The XPath query for metadata search
+     *
+     * @return LevelPeriodElement[]
      */
-    public function getExtraterrestrialArea(): Element
+    public function getExtraterrestrialAreas(string $query = ''): array
     {
-        return $this->extraterrestrialArea;
+        $extraterrestrialAreas = [];
+        $xpath = './mods:extraterrestrialArea' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $extraterrestrialAreas[] = new LevelPeriodElement($value);
+            }
+        }
+        return $extraterrestrialAreas;
     }
 }
diff --git a/src/Mods/Element/Specific/Subject/HierarchicalGeographic/Element.php b/src/Mods/Element/Specific/Subject/HierarchicalGeographic/LevelPeriodElement.php
similarity index 76%
rename from src/Mods/Element/Specific/Subject/HierarchicalGeographic/Element.php
rename to src/Mods/Element/Specific/Subject/HierarchicalGeographic/LevelPeriodElement.php
index ace2cda..25fed16 100644
--- a/src/Mods/Element/Specific/Subject/HierarchicalGeographic/Element.php
+++ b/src/Mods/Element/Specific/Subject/HierarchicalGeographic/LevelPeriodElement.php
@@ -21,7 +21,7 @@
  *
  * @access public
  */
-class Element extends BaseElement
+class LevelPeriodElement extends BaseElement
 {
     use AuthorityAttribute, LanguageAttribute;
 
@@ -40,19 +40,21 @@ public function __construct(\SimpleXMLElement $xml)
     }
 
     /**
-     * Get the value of level
+     * Get the value of the 'level' attribute.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#level
      *
      * @access public
      *
-     * @return string
+     * @return int
      */
-    public function getLevel(): string
+    public function getLevel(): int
     {
-        return $this->getStringAttribute('level');
+        return $this->getIntAttribute('level');
     }
 
     /**
-     * Get the value of period
+     * Get the value of the 'period' attribute.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#period
      *
      * @access public
      *
diff --git a/src/Mods/Element/Specific/Subject/HierarchicalGeographic/TypeElement.php b/src/Mods/Element/Specific/Subject/HierarchicalGeographic/TypeElement.php
index 89189c5..81cfdb9 100644
--- a/src/Mods/Element/Specific/Subject/HierarchicalGeographic/TypeElement.php
+++ b/src/Mods/Element/Specific/Subject/HierarchicalGeographic/TypeElement.php
@@ -17,9 +17,15 @@
  *
  * @access public
  */
-class TypeElement extends Element
+class TypeElement extends LevelPeriodElement
 {
 
+    /**
+     * @access private
+     * @var string
+     */
+    private string $attribute;
+
     /**
      * This extracts the essential MODS metadata from XML
      *
@@ -29,13 +35,14 @@ class TypeElement extends Element
      *
      * @return void
      */
-    public function __construct(\SimpleXMLElement $xml)
+    public function __construct(\SimpleXMLElement $xml, string $attribute)
     {
+        $this->attribute = $attribute;
         parent::__construct($xml);
     }
 
     /**
-     * Get the value of type
+     * Get the value of the 'xyzType' attribute.
      *
      * @access public
      *
@@ -43,6 +50,6 @@ public function __construct(\SimpleXMLElement $xml)
      */
     public function getType(): string
     {
-        return $this->getStringAttribute('type');
+        return $this->getStringAttribute($this->attribute);
     }
 }
diff --git a/src/Mods/Element/Subject.php b/src/Mods/Element/Subject.php
index 5b79e23..75f1eb1 100644
--- a/src/Mods/Element/Subject.php
+++ b/src/Mods/Element/Subject.php
@@ -25,9 +25,11 @@
 use Slub\Mods\Element\Name;
 use Slub\Mods\Element\Specific\OriginInfo\Place\Cartographics;
 use Slub\Mods\Element\Specific\Subject\HierarchicalGeographic;
+use Slub\Mods\Element\Xml\Element;
 
 /**
  * Subject MODS metadata element class for the 'php-mods-reader' library.
+ * @see https://www.loc.gov/standards/mods/userguide/subject.html
  *
  * @access public
  */
@@ -35,66 +37,6 @@ class Subject extends BaseElement
 {
     use AuthorityAttribute, LanguageAttribute, IdAttribute, XlinkHrefAttribute, AltRepGroupAttribute, DisplayLabelAttribute, UsageAttribute;
 
-    /**
-     * @access private
-     * @var AuthorityLanguageElement
-     */
-    private AuthorityLanguageElement $topic;
-
-    /**
-     * @access private
-     * @var AuthorityLanguageElement
-     */
-    private AuthorityLanguageElement $geographic;
-
-    /**
-     * @access private
-     * @var AuthorityDateLanguageElement
-     */
-    private AuthorityDateLanguageElement $temporal;
-
-    /**
-     * @access private
-     * @var TitleInfo
-     */
-    private TitleInfo $titleInfo;
-
-    /**
-     * @access private
-     * @var Name
-     */
-    private Name $name;
-
-    /**
-     * @access private
-     * @var Genre
-     */
-    private Genre $genre;
-
-    /**
-     * @access private
-     * @var HierarchicalGeographic
-     */
-    private HierarchicalGeographic $hierarchicalGeographic;
-
-    /**
-     * @access private
-     * @var Cartographics
-     */
-    private Cartographics $cartographics;
-
-    /**
-     * @access private
-     * @var AuthorityLanguageElement
-     */
-    private AuthorityLanguageElement $geographicCode;
-
-    /**
-     * @access private
-     * @var AuthorityLanguageElement
-     */
-    private AuthorityLanguageElement $occupation;
-
     /**
      * This extracts the essential MODS metadata from XML
      *
@@ -107,136 +49,235 @@ class Subject extends BaseElement
     public function __construct(\SimpleXMLElement $xml)
     {
         parent::__construct($xml);
-
-        $this->topic = new AuthorityLanguageElement($xml);
-        $this->geographic = new AuthorityLanguageElement($xml);
-        $this->temporal = new AuthorityDateLanguageElement($xml);
-        $this->titleInfo = new TitleInfo($xml);
-        $this->name = new Name($xml);
-        $this->genre = new Genre($xml);
-        $this->hierarchicalGeographic = new HierarchicalGeographic($xml);
-        $this->cartographics = new Cartographics($xml);
-        $this->geographicCode = new AuthorityLanguageElement($xml);
-        $this->occupation = new AuthorityLanguageElement($xml);
     }
 
     /**
-     * Get the value of topic
+     * Get the the array of the <topic> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#topic
      *
      * @access public
      *
-     * @return AuthorityLanguageElement
+     * @param string $query The XPath query for metadata search
+     *
+     * @return AuthorityLanguageElement[]
      */
-    public function getTopic(): AuthorityLanguageElement
+    public function getTopics(string $query = ''): array
     {
-        return $this->topic;
+        $topics = [];
+        $xpath = './mods:topic' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $topics[] = new AuthorityLanguageElement($value);
+            }
+        }
+        return $topics;
     }
 
     /**
-     * Get the value of geographic
+     * Get the the array of the <geographic> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#geographic
      *
      * @access public
      *
-     * @return AuthorityLanguageElement
+     * @param string $query The XPath query for metadata search
+     *
+     * @return AuthorityLanguageElement[]
      */
-    public function getGeographic(): AuthorityLanguageElement
+    public function getGeographics(string $query = ''): array
     {
-        return $this->geographic;
+        $geographics = [];
+        $xpath = './mods:geographic' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $geographics[] = new AuthorityLanguageElement($value);
+            }
+        }
+        return $geographics;
     }
 
     /**
-     * Get the value of temporal
+     * Get the value of the <temporal> element.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#temporal
      *
      * @access public
      *
-     * @return AuthorityDateLanguageElement
+     * @param string $query The XPath query for metadata search
+     *
+     * @return AuthorityDateLanguageElement[]
      */
-    public function getTemporal(): AuthorityDateLanguageElement
+    public function getTemporals(string $query = ''): array
     {
-        return $this->temporal;
+        $temporals = [];
+        $xpath = './mods:temporal' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $temporals[] = new AuthorityLanguageElement($value);
+            }
+        }
+        return $temporals;
     }
 
     /**
-     * Get the value of titleInfo
+     * Get the the array of the <titleInfo> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#titleinfo
      *
      * @access public
      *
-     * @return TitleInfo
+     * @param string $query The XPath query for metadata search
+     *
+     * @return TitleInfo[]
      */
-    public function getTitleInfo(): TitleInfo
+    public function getTitleInfos(string $query = ''): array
     {
-        return $this->titleInfo;
+        $titleInfos = [];
+        $xpath = './mods:titleInfo' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $titleInfos[] = new TitleInfo($value);
+            }
+        }
+        return $titleInfos;
     }
 
     /**
-     * Get the value of name
+     * Get the the array of the <name> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#name
      *
      * @access public
      *
-     * @return Name
+     * @param string $query The XPath query for metadata search
+     *
+     * @return Name[]
      */
-    public function getName(): Name
+    public function getNames(string $query = ''): array
     {
-        return $this->name;
+        $names = [];
+        $xpath = './mods:name' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $names[] = new Name($value);
+            }
+        }
+        return $names;
     }
 
     /**
-     * Get the value of genre
+     * Get the the array of the <genre> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#genre
      *
      * @access public
      *
-     * @return Genre
+     * @param string $query The XPath query for metadata search
+     *
+     * @return Genre[]
      */
-    public function getGenre(): Genre
+    public function getGenres(string $query = ''): array
     {
-        return $this->genre;
+        $genres = [];
+        $xpath = './mods:genre' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $genres[] = new Genre($value);
+            }
+        }
+        return $genres;
     }
 
     /**
-     * Get the value of hierarchicalGeographic
+     * Get the the array of the <hierarchicalGeographic> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#hierarchicalgeographic
      *
      * @access public
      *
-     * @return HierarchicalGeographic
+     * @param string $query The XPath query for metadata search
+     *
+     * @return HierarchicalGeographic[]
      */
-    public function getHierarchicalGeographic(): HierarchicalGeographic
+    public function getHierarchicalGeographics(string $query = ''): array
     {
-        return $this->hierarchicalGeographic;
+        $hierarchicalGeographics = [];
+        $xpath = './mods:hierarchicalGeographic' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $hierarchicalGeographics[] = new HierarchicalGeographic($value);
+            }
+        }
+        return $hierarchicalGeographics;
     }
 
     /**
-     * Get the value of cartographics
+     * Get the the array of the <cartographics> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#hierarchicalgeographic
      *
      * @access public
      *
-     * @return Cartographics
+     * @param string $query The XPath query for metadata search
+     *
+     * @return Cartographics[]
      */
-    public function getCartographics(): Cartographics
+    public function getCartographics(string $query = ''): array
     {
-        return $this->cartographics;
+        $cartographics = [];
+        $xpath = './mods:cartographics' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $cartographics[] = new Cartographics($value);
+            }
+        }
+        return $cartographics;
     }
 
     /**
-     * Get the value of geographicCode
+     * Get the the array of the <geographicCode> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#geographiccode
      *
      * @access public
      *
-     * @return AuthorityLanguageElement
+     * @param string $query The XPath query for metadata search
+     *
+     * @return AuthorityLanguageElement[]
      */
-    public function getGeographicCode(): AuthorityLanguageElement
+    public function getGeographicCodes(string $query = ''): array
     {
-        return $this->geographicCode;
+        $geographicCodes = [];
+        $xpath = './mods:geographicCode' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $geographicCodes[] = new AuthorityLanguageElement($value);
+            }
+        }
+        return $geographicCodes;
     }
 
     /**
-     * Get the value of occupation
+     * Get the the array of the <occupation> elements.
+     * @see https://www.loc.gov/standards/mods/userguide/subject.html#occupation
      *
      * @access public
      *
-     * @return AuthorityLanguageElement
+     * @param string $query The XPath query for metadata search
+     *
+     * @return AuthorityLanguageElement[]
      */
-    public function getOccupation(): AuthorityLanguageElement
+    public function getOccupations(string $query = ''): array
     {
-        return $this->occupation;
+        $occupations = [];
+        $xpath = './mods:occupation' . $query;
+        $element = new Element($this->xml, $xpath);
+        if ($element->exists()) {
+            foreach ($element->getValues() as $value) {
+                $occupations[] = new AuthorityLanguageElement($value);
+            }
+        }
+        return $occupations;
     }
 }
diff --git a/tests/Mods/ModsReaderTest.php b/tests/Mods/ModsReaderTest.php
index 346f066..a7ba56c 100644
--- a/tests/Mods/ModsReaderTest.php
+++ b/tests/Mods/ModsReaderTest.php
@@ -931,12 +931,28 @@ public function testGetSubjectsForBookDocument()
     {
         $subjects = $this->bookReader->getSubjects();
         self::assertNotEmpty($subjects);
-        self::assertEquals(7, count($subjects));
+        self::assertEquals(8, count($subjects));
         self::assertNotEmpty($subjects[0]->getValue());
-        //self::assertNotEmpty($subjects[0]->getTopic());
-        //self::assertNotEmpty($subjects[0]->getGeographic());
-
-        // TODO: implement reading of elements
+        $hierarchicalGeographics = $subjects[0]->getHierarchicalGeographics();
+        self::assertNotEmpty($hierarchicalGeographics);
+        self::assertNotEmpty($hierarchicalGeographics[0]->getCountries());
+        self::assertEquals(2, count($hierarchicalGeographics[0]->getCountries()));
+        self::assertEquals(1, $hierarchicalGeographics[0]->getCountries()[0]->getLevel());
+        self::assertEquals('United Kingdom', $hierarchicalGeographics[0]->getCountries()[0]->getValue());
+        self::assertNotEmpty($hierarchicalGeographics[0]->getRegions());
+        self::assertEquals('North West', $hierarchicalGeographics[0]->getRegions()[0]->getValue());
+        self::assertNotEmpty($hierarchicalGeographics[0]->getCounties());
+        self::assertEquals('Cumbria', $hierarchicalGeographics[0]->getCounties()[0]->getValue());
+        self::assertNotEmpty($hierarchicalGeographics[0]->getCities());
+        self::assertEquals('Providence', $hierarchicalGeographics[0]->getCities()[0]->getValue());
+        self::assertNotEmpty($hierarchicalGeographics[0]->getCitySections());
+        self::assertEquals(2, count($hierarchicalGeographics[0]->getCitySections()));
+        self::assertEquals('neighborhood', $hierarchicalGeographics[0]->getCitySections()[0]->getType());
+        self::assertEquals(1, $hierarchicalGeographics[0]->getCitySections()[0]->getLevel());
+        self::assertEquals('East Side', $hierarchicalGeographics[0]->getCitySections()[0]->getValue());
+        self::assertNotEmpty($hierarchicalGeographics[0]->getAreas());
+        self::assertEquals('national park', $hierarchicalGeographics[0]->getAreas()[0]->getType());
+        self::assertEquals('Lake District', $hierarchicalGeographics[0]->getAreas()[0]->getValue());
     }
 
     public function testGetSubjectsByQueryForBookDocument()
@@ -944,11 +960,15 @@ public function testGetSubjectsByQueryForBookDocument()
         $subjects = $this->bookReader->getSubjects('[./mods:topic="Mass media"]');
         self::assertNotEmpty($subjects);
         self::assertEquals(1, count($subjects));
+        self::assertNotEmpty($subjects[0]->getAuthority());
+        self::assertEquals('lcsh', $subjects[0]->getAuthority());
         self::assertNotEmpty($subjects[0]->getValue());
-        //self::assertNotEmpty($subjects[0]->getTopic());
-        //self::assertNotEmpty($subjects[0]->getGeographic());
-
-        // TODO: implement reading of elements
+        self::assertNotEmpty($subjects[0]->getTopics());
+        self::assertEquals(2, count($subjects[0]->getTopics()));
+        self::assertEquals('Political aspects', $subjects[0]->getTopics()[1]->getValue());
+        self::assertNotEmpty($subjects[0]->getGeographics());
+        self::assertEquals(1, count($subjects[0]->getGeographics()));
+        self::assertEquals('United States', $subjects[0]->getGeographics()[0]->getValue());
     }
 
     public function testGetNoSubjectsByQueryForBookDocument()
@@ -961,12 +981,15 @@ public function testGetSubjectsForSerialDocument()
     {
         $subjects = $this->serialReader->getSubjects();
         self::assertNotEmpty($subjects);
-        self::assertEquals(6, count($subjects));
+        self::assertEquals(7, count($subjects));
         self::assertNotEmpty($subjects[0]->getValue());
-        //self::assertNotEmpty($subjects[0]->getTopic());
-        //self::assertNotEmpty($subjects[0]->getGenre());
+        self::assertNotEmpty($subjects[0]->getCartographics());
 
-        // TODO: implement reading of elements
+        // TODO: implement reading of cartographics
+        /*self::assertNotEmpty($subjects[0]->getCartographics()[0]->getCoordinates());
+        self::assertEquals('', $subjects[0]->getCartographics()[0]->getCoordinates()[0]->getValue());
+        self::assertNotEmpty($subjects[0]->getCartographics()[0]->getScale());
+        self::assertNotEmpty($subjects[0]->getCartographics()[0]->getProjection());*/
     }
 
     public function testGetSubjectsByQueryForSerialDocument()
@@ -975,10 +998,10 @@ public function testGetSubjectsByQueryForSerialDocument()
         self::assertNotEmpty($subjects);
         self::assertEquals(1, count($subjects));
         self::assertNotEmpty($subjects[0]->getValue());
-        //self::assertNotEmpty($subjects[0]->getForm());
-        //self::assertNotEmpty($subjects[0]->getGenre());
-
-        // TODO: implement reading of elements
+        self::assertNotEmpty($subjects[0]->getTopics());
+        self::assertEquals('Web sites', $subjects[0]->getTopics()[0]->getValue());
+        self::assertNotEmpty($subjects[0]->getGenres());
+        self::assertEquals('Directories', $subjects[0]->getGenres()[0]->getValue());
     }
 
     public function testGetNoSubjectsByQueryForSerialDocument()
diff --git a/tests/resources/mods_book.xml b/tests/resources/mods_book.xml
index a656b47..c09a09a 100644
--- a/tests/resources/mods_book.xml
+++ b/tests/resources/mods_book.xml
@@ -78,6 +78,18 @@
     <abstract displayLabel="Content description">Test description for document which contains display label.</abstract>
     <note type="statement of responsibility">Eric Alterman.</note>
     <note type="bibliography">Includes bibliographical references (p. 291-312) and index.</note>
+    <subject>
+        <hierarchicalGeographic>
+            <country level="1">United Kingdom</country>
+            <country level="2">England</country>
+            <region>North West</region>
+            <county>Cumbria</county>
+            <city>Providence</city>
+            <citySection citySectionType="neighborhood" level="1">East Side</citySection>
+            <citySection citySectionType="neighborhood" level="2">Blackstone</citySection>
+            <area areaType="national park">Lake District</area>
+        </hierarchicalGeographic>
+    </subject>
     <subject>
         <geographicCode authority="marcgac">n-us---</geographicCode>
     </subject>
diff --git a/tests/resources/mods_serial.xml b/tests/resources/mods_serial.xml
index 60ee312..e608c84 100644
--- a/tests/resources/mods_serial.xml
+++ b/tests/resources/mods_serial.xml
@@ -51,6 +51,13 @@
     <note>Latest issue consulted: V. 9 no. 1 (spring 2008) (viewed Sept. 5, 2008).</note>
     <note type="system details">Mode of access: World Wide Web.</note>
     <note>Electronic serial in HTML format.</note>
+    <subject>
+        <cartographics>
+            <coordinates>E 72°--E 148°/N 13°--N 18°</coordinates>
+            <scale>1:22,000,000</scale>
+            <projection>Conic proj</projection>
+        </cartographics>
+    </subject>
     <subject authority="lcsh">
         <topic>Academic libraries</topic>
         <genre>Periodicals</genre>