Columbia subject headings:
Arab countries--History--20th century.
Arab countries--Politics and government.
Communism--Arab countries.
Communist parties--Arab countries.
Harvard subject headings:
Arab countries--Politics and government--1920-1991.
Communism--Arab countries
Communist parties--Arab countries.
Princeton subject headings:
Arab countries--History--20th century.
Arab countries--Politics and government.
Communism--Arab countries.
Communist parties--Arab countries.