Biblio
“A Trip To The Summit Of Orizaba, The Altitudes Of Orizaba And Popocatepetl Effects Of High-Mountain Climbing”. Appalachia Vol. VIII (No. 4). Appalachia.
. 1898. ![application/pdf PDF icon](/modules/file/icons/application-pdf.png)
“An Ascent Of Popocatepetl”. Popular Astronomy. Popular Astronomy.
. 1898. ![application/pdf PDF icon](/modules/file/icons/application-pdf.png)
. 1897.
Douglass, AE_An Ascent of Popocatepetl_1897.pdf (1.92 MB)
![application/pdf PDF icon](/modules/file/icons/application-pdf.png)