Columbia subject headings:
Harvard subject headings:
Betancourt, Rómulo, 1908-1981.
Colombia--History--1946-1974.
Lleras Restrepo, Carlos, 1908-1994.
Venezuela--History--1935-1958
Venezuela--History--1935-1974.
Princeton subject headings:
Betancourt, Rómulo, 1908-1981.
Colombia--History--1946-1974.
Lleras Restrepo, Carlos, 1908-1994.
Venezuela--History--1935-1958.