Columbia subject headings:
Bolivia--Economic conditions.
Bolivia--Foreign relations--Brazil.
Brazil--Economic conditions.
Brazil--Foreign relations--Bolivia.
Petroleum--Bolivia.
Petroleum--Brazil.
Harvard subject headings:
Petroleum industry and trade--Bolivia
Petroleum industry and trade--Brazil
Princeton subject headings:
Bolivia--Economic conditions.
Bolivia--Foreign relations--Brazil.
Brazil--Economic conditions.
Brazil--Foreign relations--Bolivia.
Petroleum--Bolivia.
Petroleum--Brazil.