Hi Bonnie,
I had a similar problem with my DOHRMANN ancestors until someone told
me that an alternate name for Norden is actually Nartum (which is what
you'll see on maps today). Nartum is a small town between Bremen and
Hamburg, just north of the Autobahn. The community belonged to the
parish of Gyhum after about 1798 (approximately), before that they
worshipped at Sottrum. The Ortsfamilienbuch for Gyhum used to be
available on line but as of this morning it doesn't seem to be.
Try the Gyhum parish either at familysearch.org or at your local LDS
Family History Center - and good luck!
Art Dohrman
Huntsville AL