National Archives of Poland

National Library of Poland

Baltic Connections Project - Uncovering the common past of the countries around the Baltic Sea (1450-1800).

FEEFHS Map Room - 50 detailed maps of Germany, Austria-Hungary, Russia, the Balkans, and the Baltics from the 1882 Blackie and Sons atlas, all available at the site of the Federation of East European Family History Societies. The same site also includes a nice Genealogy Resource Directory.

Poland

List of Resources by Country and Region

Polish Timelines and Scenarios

Polish Points of Divergence