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