Columbia subject headings:
Poland--History--Occupation, 1939-1945--Sources.
Poland--Relations--Soviet Union--Sources.
Soviet Union--Relations--Poland--Sources.
Harvard subject headings:
Poland--History--Occupation, 1939-1945--Sources.
Poland--Relations--Soviet Union--Sources.
Polish people--Belarus--History--20th century--Sources.
Soviet Union--Relations--Poland--Sources.
Princeton subject headings:
Belarus--History--1917-1991--Sources.
Poland--History--Occupation, 1939-1945--Sources.
Polish people--Belarus--History--20th century--Sources.