diff --git a/exceptions/MDImporterMissingConcordance.php b/exceptions/MDImporterMissingConcordance.php
index 69f5545..bb9ae96 100644
--- a/exceptions/MDImporterMissingConcordance.php
+++ b/exceptions/MDImporterMissingConcordance.php
@@ -46,7 +46,7 @@ final class MDImporterMissingConcordance extends Exception {
 
         }
 
-        $exception = new MDImporterMissingConcordance("Unmapped specific value of type " . $target_type . ": " . $value_to_map);
+        $exception = new MDImporterMissingConcordance("Unmapped specific value of type " . $target_type . ": " . $value_to_map . PHP_EOL . "Please consult https://concordance.museum-digital.org for filling out missing concordances");
         $exception->target_type = $target_type;
         $exception->value_to_map = $value_to_map;
 
diff --git a/src/MDConcCertainty.php b/src/MDConcCertainty.php
index 4ff04ab..bf6412b 100644
--- a/src/MDConcCertainty.php
+++ b/src/MDConcCertainty.php
@@ -37,6 +37,7 @@ final class MDConcCertainty implements MDImporterConcordanceListInterface {
         // Certain
 
         'sicher' => true,
+        'Herstellung' => true,
         'gesichert' => true,
         'nach Passepartoutnotiz' => true,
         'Zusammenarbeit mit' => true,
diff --git a/src/MDConcMeasurementTypes.php b/src/MDConcMeasurementTypes.php
index 2cc62b5..9432218 100644
--- a/src/MDConcMeasurementTypes.php
+++ b/src/MDConcMeasurementTypes.php
@@ -732,12 +732,16 @@ final class MDConcMeasurementTypes implements MDImporterConcordanceListInterface
             "Breite (Sockel)" => MDMeasurementType::height_socle,
 
             "Höhe (Blatt)",
+            "Höhe (Blattmaß)",
+            "Höhe (Blattmass)",
             "Blattmaß (Höhe)",
             "Höhe (Blatt/Platte)",
             "Höhe (Blatt (mittig gefalzt))",
             "Blattmass (Höhe)" => MDMeasurementType::height_sheet_size,
 
             "Breite (Blatt)",
+            "Breite (Blattmass)",
+            "Breite (Blattmaß)",
             "Blattmaß (Breite)",
             "Breite (Batt)",
             "Breite (Blatt/Platte)",
@@ -747,11 +751,19 @@ final class MDConcMeasurementTypes implements MDImporterConcordanceListInterface
 
             "Blattmaß (Länge)",
             "Blattmaß (Tiefe)",
+            "Länge (Blatt)",
+            "Tiefe (Blatt)",
+            "Länge (Blattmaß)",
+            "Tiefe (Blattmaß)",
+            "Länge (Blattmass)",
+            "Tiefe (Blattmass)",
             "Blattmass (Länge)",
             "Tiefe/Länge (Blatt)",
             "Blattmass (Tiefe)" => MDMeasurementType::length_sheet_size,
 
             "Höhe (Bild)",
+            "Höhe (Bildmaß)",
+            "Höhe (Bildmass)",
             "Höhe (Darstellung)",
             "Höhe (Darsetllung)",
             "Höhe (Blatt/Darstellung)",
@@ -771,6 +783,8 @@ final class MDConcMeasurementTypes implements MDImporterConcordanceListInterface
             "Bildmass (Höhe)" => MDMeasurementType::height_image_size,
 
             "Breite (Bild)",
+            "Breite (Bildmaß)",
+            "Breite (Bildmass)",
             "Breite (Darstellung)",
             "Breite (Darsetllung)",
             "Breite (Blatt/Darstellung)",