This article is from the German Genealogy FAQ, by Jim Eggert EggertJ@crosswinds.net with numerous contributions by others.
If you know the title and author, go to your favorite library and
ask the librarian for help. They can often get books through
interlibrary loan; fees may be involved.
If you don't know exactly what you are looking for, try browsing
one of the online library catalogs. Some of the best are
Harvard University <http://hollisweb.harvard.edu/>
University of California (UC) <http://www.cdlib.org/>
US Library of Congress (LOC) <http://catalog.loc.gov/>
Deutsches Bibliotheksinstitut (DBI) <http://www.dbilink.de/>
Karlsruher Virtueller Katalog (KVK)
<http://www.ubka.uni-karlsruhe.de/kvk.html>
Search engine for a number of German online catalogs.
For lists of other such online catalogs, and there are many, try
<http://www.hbz-nrw.de/hbz/germlst/index.html>
<http://sunsite.berkeley.edu/Libweb/>
<http://www.grass-gis.de/bibliotheken/>
To find German-language books in print, use the Verzeichnis
Lieferbarer B"ucher at
<http://www.buchhandel.de/>
To purchase books from Germany, try an online German bookseller:
<http://www.schoenhuber.de/> B"ucherzentrum Sch"onhuber
<http://www.struppe-online.de/> Sack/Struppe & Winckler
<http://www.osiander.de/> Osiandersche Buchhandlung
<http://www.books.de/> Bouvier/Gonski
<http://www.amazon.de/> Amazon.de
<http://www.roesslitor.ch/> R"osslitor (Swiss)
Lists of publishers and bookstores with an Internet presence are at
<http://www.chemie.fu-berlin.de/outerspace/verlage.html>
<http://www.genealogy.net/misc/verlage.html>
 
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