Columbia subject headings:
Oil and gas leases--Peru.
Petroleum industry and trade--Government policy--Peru.
Petróleos del Perú.
Harvard subject headings:
Oil and gas leases--Peru.
Petroleum industry and trade--Government policy--Peru.
Petróleos del Perú.
Princeton subject headings:
Petroleum industry and trade--Government policy--Peru.
Petroleum law and legislation--Peru.
Petróleos del Perú.