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Petróleo – Explotación – Perú – Siglo XX (7)
Petróleo – Perú – Piura – Siglo XX (7)
Petróleo – Perú – Tumbes – Siglo XX (5)
International Petroleum Company (4)
Compañía Petrolera Lobitos (3)
Aguas subterráneas – Perú – Piura (2)
El Oncenio, 1919-1930 (2)
Industria minera--África (2)
Minería (2)
Oil (2)
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