Columbia subject headings:
Poland--Politics and government--1918-1945.
World War, 1939-1945--Underground literature--Poland.
Harvard subject headings:
Poland--Politics and government--1918-1945
World War, 1939-1945--Underground literature--Poland.
Princeton subject headings:
Poland--Politics and government--1918-1945.
World War, 1939-1945--Underground literature--Poland.