Columbia subject headings:
Harvard subject headings:
Diplomatic and consular service--Poland--History--20th century.
Military intelligence--Poland--History--20th century.
Poland. Ministerstwo Spraw Zagranicznych.
Political persecution--Ukraine--History--20th century.
Political persecution--Ukraine.
Political purges--Ukraine--History--20th century.
Ukraine--History--1921-1944.
Ukraine--Politics and government--1917-1945.
Princeton subject headings:
Collectivization of agriculture--Ukraine.
Genocide--Ukraine.
Political atrocities--Ukraine.
Ukraine--History--Famine, 1932-1933.