Columbia subject headings:
Europe--Politics and government--1918-1945.
Poland--History--1918-1945.
World War, 1939-1945--Underground movements--Poland.
Harvard subject headings:
Europe--Politics and government--1918-1945.
Poland--History--1918-1945
World War, 1939-1945--Underground movements--Poland.
Princeton subject headings:
World War, 1939-1945--Diplomatic history.
World War, 1939-1945--Europe.
World War, 1939-1945--Poland.
World War, 1939-1945--Underground movements--Poland.