diff --git a/src/MDConcCertainty.php b/src/MDConcCertainty.php
new file mode 100644
index 0000000..9b0da95
--- /dev/null
+++ b/src/MDConcCertainty.php
@@ -0,0 +1,43 @@
+<?PHP
+/**
+ * Mapping for certainty-expressing fields to certainty in events.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Mapping for certainty-expressing fields to certainty in events.
+ */
+final class MDConcCertainty implements MDImporterConcordanceListInterface {
+
+    private const MAPPING = [
+
+        // Uncertain
+
+        'fraglich' => false,
+
+        // Certain
+
+        'sicher' => true,
+        'by' => true,
+
+    ];
+
+    /**
+     * Require a function for getting the concordance target.
+     *
+     * @param string $input Input string.
+     *
+     * @return boolean
+     */
+    public static function getConcordanceTarget(string $input):bool {
+
+        if (!isset(self::MAPPING[$input])) {
+            throw new MDImporterMissingConcordance("Unknown certainty identifier: " . $input);
+        }
+
+        return self::MAPPING[$input];
+
+    }
+}
diff --git a/src/MDConcFieldRelatedWorksType.php b/src/MDConcFieldRelatedWorksType.php
index 00f256e..6669391 100644
--- a/src/MDConcFieldRelatedWorksType.php
+++ b/src/MDConcFieldRelatedWorksType.php
@@ -48,6 +48,7 @@ enum MDConcFieldRelatedWorksType {
 
             "Teil von",
             "ist Teil von",
+            "ist physischer Teil von",
             "Gehört zu",
             "gehört zu",
             "Gehört zu Sammlung",
diff --git a/src/MDConcMeasurementTypes.php b/src/MDConcMeasurementTypes.php
index 9a912c4..acda456 100644
--- a/src/MDConcMeasurementTypes.php
+++ b/src/MDConcMeasurementTypes.php
@@ -174,6 +174,7 @@ final class MDConcMeasurementTypes implements MDImporterConcordanceListInterface
             "(Höhe)",
             " (Höhe)",
             "Höhe (gesamt)",
+            "Höhe (Blatt)",
             "Höhe (ausgeklappt)",
             "height",
             "height (overall)",
@@ -228,6 +229,7 @@ final class MDConcMeasurementTypes implements MDImporterConcordanceListInterface
             "Breite H",
             "Breite (ausgeklappt)",
             "Breite (aufgeschlagen)",
+            "Breite (Blatt)",
             "Breite (gesamt)",
             "(Breite)",
             "Lichtmass (Breite)",