Hi Laraine:
I think you are right to post two queries, it helps to keep information seperate and makes it less confusing for others.
http://www.familysearch.org/Eng/Library/FHLC/frameset_fhlc.asp
Once again the FHC has a lot of info on Aurich.
Germany, Preu�en, Hannover, Aurich - Archives and libraries
Germany, Preu�en, Hannover, Aurich - Archives and libraries - Inventories, registers, catalogs
Germany, Preu�en, Hannover, Aurich - Church records
Germany, Preu�en, Hannover, Aurich - Civil registration
Germany, Preu�en, Hannover, Aurich - Jewish records
Germany, Preu�en, Hannover, Aurich - Jewish records - Inventories, registers, catalogs
Germany, Preu�en, Hannover, Aurich - Medical records
For Aurich-Oldendorf:
Germany, Preu�en, Hannover, Aurich-Oldendorf - Church records
Germany, Preu�en, Hannover, Aurich-Oldendorf - Civil registration
Germany, Preu�en, Hannover, Aurich-Oldendorf - Genealogy
I won't list the info on Ostfriesland as it is so long.
First before you start looking at any of the microfilms for the above, make sure they are the right towns, etc. Many times there are towns, districts, etc with the same or similar names. I just did a quick search.
Gale