Search for: [Subject and Keywords = Jews] OR [Subject and Keywords = Central\-Eastern Europe] OR [Subject and Keywords = ethnic relations] OR [Subject and Keywords = sociology] OR [Subject and Keywords = Żydzi] OR [Subject and Keywords = Europa Środkowo\-Wschodnia] OR [Subject and Keywords = stosunki etniczne] OR [Subject and Keywords = socjologia] OR [Subject and Keywords = 1901\-1914 r.] OR [Title = Was sind Ostjuden\? \: zur ersten Information] OR [Title = Was sind Ostjuden\? \: zur ersten Information] OR [Creator = Birnbaum, Nathan \(1864–1937\)] OR [Creator = Birnbaum, Nathan \(1864–1937\)]