Columbia subject headings:
Petroleum industry and trade--Government policy--United States--History--20th century.
United States--Economic conditions--1971-1981.
Harvard subject headings:
Petroleum industry and trade--Government policy--United States--History--20th century.
United States--Economic conditions--1971-1981.
Princeton subject headings:
Petroleum industry and trade--Government policy--United States--History--20th century.
United States--Economic conditions--1971-.