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PreviewIssue DateTitleAuthor(s)
Johson-1955-Geology_ore_deposits.pdf.jpg1955Geology and ore deposits of Atacocha district, departmento de Pasco, PeruJohnson, Robert Francis; Lewis, Richard W.; Abele C., Guillermo
Bodenlos-plate-06.pdf.jpg1955Lead-zinc deposits of Cordillera Blanca and northern Cordillera Huayhuash, PeruBodenlos, Alfred J.; Ericksen, George Edward