Columbia subject headings:
Poland--Foreign relations--Soviet Union.
Poland--Politics and government--1918-1945.
Soviet Union--Foreign relations--Poland.
World War, 1939-1945--Poland.
Harvard subject headings:
Poland--Foreign relations--Soviet Union
Poland--Politics and government--1918-1945
Soviet Union--Foreign relations--Poland.
World War, 1939-1945--Poland.
Princeton subject headings:
Poland--Foreign relations--Soviet Union.
Poland--History--Occupation, 1939-1945.
Soviet Union--Foreign relations--Poland.