Columbia subject headings:
Poland--Foreign relations--Soviet Union--Sources.
Poland--History--Occupation, 1939-1945--Sources.
Soviet Union--Foreign relations--1917-1945--Sources.
Soviet Union--Foreign relations--Poland--Sources.
Harvard subject headings:
Poland--Foreign relations--Soviet Union--Sources.
Poland--History--Occupation, 1939-1945--Sources.
Soviet Union--Foreign relations--1917-1945--Sources.
Soviet Union--Foreign relations--Poland--Sources.
Princeton subject headings:
Poland--Foreign relations--Soviet Union--Sources.
Poland--History--Occupation, 1939-1945--Sources.
Soviet Union--Foreign relations--1939-1945--Sources.
Soviet Union--Foreign relations--Poland--Sources.