Search for: [Subject and Keywords = national minorities] OR [Subject and Keywords = Poland] OR [Subject and Keywords = law] OR [Subject and Keywords = the 20th century] OR [Subject and Keywords = mniejszości narodowe] OR [Subject and Keywords = Polska] OR [Subject and Keywords = prawo] OR [Subject and Keywords = 20 w.] OR [Title = Przyczynek do traktatu o ochronie mniejszości narodowych] OR [Title = Przyczynek do traktatu o ochronie mniejszości narodowych] OR [Creator = Lubowicki, Jerzy] OR [Creator = Lubowicki, Jerzy]