Columbia subject headings:
Harvard subject headings:
Anti-Nazi movement--Germany--Congresses
Germany--Relations--Poland--Congresses.
Poland--Relations--Germany--Congresses
World War, 1939-1945--Diplomatic history--Congresses.
World War, 1939-1945--Underground movements--Poland--Congresses.
Princeton subject headings:
Germany--Politics and government--20th century--Sources.
Germany--Relations--Poland--History--Sources.
Poland--Politics and government--20th century--Sources.
Poland--Relations--Germany--History.
World War, 1939-1945--Poland--Sources.