Columbia subject headings:
Poland--Politics and government--1796-1918.
Poland--Politics and government--1918-1945.
Harvard subject headings:
Poland--Politics and government--1796-1918
Poland--Politics and government--1918-1945
Poland--Politics and government--1945-1980
Princeton subject headings:
Poland--Politics and government--1796-1918.
Poland--Politics and government--1918-1945.
Poland--Politics and government--1945-1980.