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by Salinas, Edwin | Arenas, William | Anco, Jorge | Borda, Ignacio | Charagua, Gaby.
by Toledo Garay, Fernando Enrique | Instituto de Ingenieros de Minas del Perú | Universidad Nacional Mayor de San Marcos. Fondo Editorial.
by Chipana, Alex | Figueroa, Enrique | Menacho, Iván | Pérez, Pedro | Sosa, Oscar | Velásquez, Julio, Hermes.
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