Charles D. Walcott: A Geologist's Paradise. National Geographic Magazine. Vol. 22, pp. 509–521, image on page 515 . 1911 4 A cool September morning at 7,000 feet above sea-level
Size: 2687px × 1860px
Photo credit: © History and Art Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords:
