Columbia subject headings:
Communism--Poland--History--Sources.
Poland--Foreign relations--1918-1945--Sources.
Poland--Foreign relations--Soviet Union--Sources.
Soviet Union--Foreign relations--Poland--Sources.
World War, 1939-1945--Diplomatic history--Sources.
Harvard subject headings:
Poland--Foreign relations--Soviet Union--Sources.
Soviet Union--Foreign relations--Poland--Sources.
Princeton subject headings:
Communism--Poland--History--Sources.
Poland--Foreign relations--1918-1945--Sources.
Poland--Foreign relations--Soviet Union--Sources.
Soviet Union--Foreign relations--Poland--Sources.
World War, 1939-1945--Diplomatic history--Sources.