Columbia subject headings:
Brazil--Economic conditions--1945-
Brazil--Foreign relations--1930-1945.
Petroleum industry and trade.
World politics--1955-1965.
Harvard subject headings:
Brazil--Economic conditions--1945-
Brazil--Foreign relations--20th century.
Petroleum industry and trade.
World politics--1945-
Princeton subject headings:
Brazil--Economic conditions.
Brazil--Politics and government--1954-.
Brazil--Social conditions.