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Agricultura – Perú – Ancash – Siglo XX (1)
Algodón – Cultivo – Perú – Ancash – Siglo XX (1)
Caña de azúcar – Cultivo – Perú – Ancash – Siglo XX (1)
Irrigación – Perú – Ancash – Siglo XX (1)
Perú. Ministerio de Fomento. Cuerpo de Ingenieros de Minas y Aguas (1)
Portocarrero, Juan N. (1)
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