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Douglass, AE. 1898. ?An Ascent Of Popocatepetl?. Popular Astronomy. Popular Astronomy.\par \par Cogshall, WA, and AE Douglass. 1898. ?A Trip To The Summit Of Orizaba, The Altitudes Of Orizaba And Popocatepetl Effects Of High-Mountain Climbing?. Appalachia Vol. VIII (No. 4). Appalachia.\par \par Douglass, AE. 1897. ?An Ascent Of Popocatepetl?.\par \par }