Columbia subject headings:
Poland--Foreign relations--20th century.
Poland--Foreign relations--Sources--20th century.
Soviet Union--Foreign relations--Sources.
Soviet Union--Foreign relations.
Harvard subject headings:
Diplomatic and consular service, Polish--Soviet Union--History--Sources.
Poland--Foreign relations--Soviet Union--Sources.
Poland. Ambasada (Soviet Union)--History--Sources.
Soviet Union--Foreign relations--Poland--Sources.
Soviet Union--Politics and government--1917-1936--Sources.
Princeton subject headings: