Please provide sources/associations able to supply info for my
genealogical research relating to persons in the former East Prussia (
Ostpreussen ), Germany, till 1945.The southern part of this former
German province is now part of Poland and the northern region is a
part of Russia ( a Russian exclave bordering the Baltic Sea).Thank
you.  HENRY W BEHRENS

Dear Mr. Behrens, 

As someone whose family also descents from the former German
territories (in my case Schlesien, Silesia), I answer your question
with lots of interest.

There are many sites and bodies that could provide you with assistance
in your research. The most comprehensive source was already mentioned
by the commentator fp-ga
<http://www.genealogienetz.de/reg/OPRU/oprus.html>.


Tips and Online Resources
=========================
East Prussian Genealogy - http://www.paetzel.info <tips see at
http://www.paetzel.info/tips.htm>.

East Prussian Links -
http://www.nex.com.au/users/carlnpat/Oefrr007.htm

Genealogy and Poland - A Guide -
http://www.polishroots.org/genpoland/index.htm

Ost Preußen / Preussen (East Prussia) Research List -
http://www.feefhs.org/de/opru/oprurl/oprurl.html - a combination
between forums and resource list.

Roots Web - http://www.rootsweb.com/~deupru/

Genealogical Guide to East and West Prussia -
http://www.cyberspace.org/~goertz/new.html

THIS AND THAT GENEALOGY TIPS ON GERMAN RECORDS  -
http://homepages.rootsweb.com/~hornbeck/germrec.htm

Prussian Genealogy Links -
http://www.geocities.com/SiliconValley/Haven/1538/prussia.html


Forums
======
Cousin Connect - http://www.cousinconnect.com/p/a/1092/sa/ 

Ost Preußen / Preussen (East Prussia) Research List -
http://www.feefhs.org/de/opru/oprurl/oprurl.html - a combination
between forums and resource list.

soc.genealogy.german -
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&group=soc.genealogy.german

soc.genealogy.surnames.german -
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&group=soc.genealogy.surnames.german

And if you happen to be Jewish (many Jews come from this region) :
soc.genealogy.jewish  -
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&group=soc.genealogy.jewish


East Prussian Family Sites
==========================
Matthia - http://www.matthia.org/index.html 

Noreikat - http://members.shaw.ca/manfredjoan/ 


Maps of East Prussia
====================
http://feefhs.org/maps/gere/ge-eprus.html 

http://www.geog.byu.edu/plewe/plewe-gen/maps.htm 

http://www.genealogyunlimited.com/prussia.html 


General Societies
=================
East European Genealogical Society Inc. -
http://www.eegsociety.org/Index.html - membership is required.

The Society of German Geneology in Eastern Europe -
http://www.sggee.org/


Behrens Geneology
=================
Ancestry Boards - http://boards.ancestry.com/mbexec/board/an/surnames.behrens

Cousin Connect - http://www.cousinconnect.com/p/a/0/s/BEHRENS 

Behrens Surname Resources -
http://genealogyregister.com/genealogy.cgi/Behrens/


I hope that answered your question. Feel free to contact me if you
need any clarification on this answer. I'd be pleased to clarify my
answer before you rate it.

How about this site?

http://www.genealogienetz.de/reg/OPRU/oprus.html

I found this. I submitted a search for East Prussia on the
geneacological site I found. Hope it's some use;
http://search.nara.gov/query.html?rq=0&qp=&rq=0&qt=East+Prussia&col=4ardor&col=3ourdoc&col=2pres&col=1arch&qs=&qc=&pw=100%25&ws=0&la=&qm=0&st=1&nh=10&lk=1&rf=0&oq=&rq=0