UC Davis Geology: International Year of Planet Earth

Portrait of John Wesley Powell (age 57) on horseback near Flagstaff, Arizona,
a guest of D. M. Riordan. Circa 1891. photo 17230: 20070920202002.jpg

March 24, 1834 - John Wesley Powell's birthday
Grand Canyon Explorer. In 1869, Powell explored
the Grand Canyon via the Colorado River.

from the National Park Service: Powell expedition photos

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