Columbia subject headings:
Communism--History.
Communist countries--Foreign relations--19th century.
Communist countries--Foreign relations--20th century.
Communist strategy.
World politics--1945-1989.
Harvard subject headings:
Communism--History
Communist countries--Foreign relations--History--19th century.
Communist countries--Foreign relations--History--20th century.
Communist strategy.
World politics--1945-
Princeton subject headings:
Communism--History.
Communist countries--Foreign relations--History--19th century.
Communist countries--Foreign relations--History--20th century.
Communist strategy.
World politics--1945-1989.