Columbia subject headings:
Poland--History--Occupation, 1939-1945--Sources.
Poland. Polskie Siły Zbrojne. Narodowe Siły Zbrojne--History--Sources.
World War, 1939-1945--Underground movements--Poland--Sources.
Harvard subject headings:
Poland--History--Occupation, 1939-1945--Sources.
Poland. Polskie Siły Zbrojne. Narodowe Siły Zbrojne--Sources.
World War, 1939-1945--Underground movements--Poland--Sources.
Princeton subject headings:
Poland--History--Occupation, 1939-1945--Sources.
Poland. Polskie Siły Zbrojne. Narodowe Siły Zbrojne--History--Sources.
World War, 1939-1945--Underground movements--Poland--Sources.