BKG-database “Historical Place Names”

The Federal Agency for Cartography and Geodesy offers reproductions of maps of the eastern regions that belong to Germany before 1918. Topograhic maps (1: 25 000, 1: 100 000) as well as general maps of East Prussia, Pomerania and Silesia (1: 300 000) can be purchased online.
The data base Historical Place Names provides information about various different names of villages and cities in the past and about the affiliation of the settlements to administrative districts.