Columbia subject headings:
Ecuador--Economic conditions--1972-
Petroleum industry and trade--Ecuador.
Petroleum products--Prices--Ecuador.
Power resources--Ecuador.
Harvard subject headings:
Ecuador--Economic conditions--1972-
Petroleum industry and trade--Ecuador
Petroleum products--Prices--Ecuador.
Power resources--Ecuador.
Princeton subject headings:
Petroleum industry and trade--Ecuador--Statistics.
Petroleum industry and trade--Ecuador.