Explorations and field-work of the Smithsonian Institution in .. . Fig. 4.—The Barrealcs. Looking from flanks of the Sierra de Los Muertos,across the mud plains to the Banco Lucero. Northern Qiihuahua. SMITHSONIAN EXPLORATIONS, 1934. Fig. 5.—Popocatepetl, Mexicos famous volcanic peak. ( Photograph hyT. Skewes Saunders.)

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1912