diff --git a/oaipmh-core/src/main/java/info/textgrid/middleware/IdentifierListDelivererDC.java b/oaipmh-core/src/main/java/info/textgrid/middleware/IdentifierListDelivererDC.java
index ba6b3b6d91f363fe39e66f47f0d9a0e1f68349e1..4a7d1c24bccaf423e4643cf9e55fd68303dc90b0 100644
--- a/oaipmh-core/src/main/java/info/textgrid/middleware/IdentifierListDelivererDC.java
+++ b/oaipmh-core/src/main/java/info/textgrid/middleware/IdentifierListDelivererDC.java
@@ -188,12 +188,17 @@ public class IdentifierListDelivererDC extends IdentifierListDelivererAbstract {
 
         System.out.println("  ##  dateOfObjectCreation  -->  " + this.dateOfObjectCreation);
 
-        System.out.println("  ##  keys     -->  " + hit.getSourceAsMap().keySet());
         System.out.println("  ##  entries  -->  " + hit.getSourceAsMap().entrySet());
         System.out.println("  ##  " + this.dateOfObjectCreation + "(" + hit.getId() + ")  -->  "
             + (hit.getSourceAsMap().get(this.dateOfObjectCreation) == null ? "NULL"
                 : hit.getSourceAsMap().get(this.dateOfObjectCreation)));
 
+        System.out.println("  ##  containsKey  -->  "
+            + hit.getSourceAsMap().containsKey(this.dateOfObjectCreation));
+        System.out
+            .println("  ##  get  -->  " + hit.getSourceAsMap().get(this.dateOfObjectCreation));
+        System.out.println("  ##  innerHits  -->  " + hit.getInnerHits());
+
         try {
           this.datestamp = hit.getSourceAsMap().get(this.dateOfObjectCreation).toString();