Photo of the Colorado River below Hidden Passage in Glen Canyon, taken by Alvin Colville during a July 1962 river trip
Photo of Mystery Canyon off the Colorado River in Glen Canyon, taken during Alvin Colville's July 19...
Photo of Alvin bridging over a pool in Hidden Passage off the Colorado River in Glen Canyon, taken d...
Photo of Alex and Alvin in Hidden Passage off the Colorado River in Glen Canyon, taken during Alvin ...
Photo of the Colorado River below Hidden Passage in Glen Canyon, taken by Alvin Colville during a Ju...
Photo of the Colorado River below Hidden Passage in Glen Canyon, taken by Alvin Colville during a Ju...
Photo of the Colorado River below Hidden Passage in Glen Canyon, taken by Alvin Colville during a Ju...
Photo of the Colorado River below Hidden Passage in Glen Canyon, taken by Alvin Colville during a Ju...
Photo of Hidden Passage off the Colorado River in Glen Canyon, taken during Alvin Colville's July 19...
Photo of the entrance to Hidden Passage in Glen Canyon on the Colorado River, taken during Alvin Col...
Photo of crew in Hidden Passage off the Colorado River in Glen Canyon, taken during Alvin Colville's...
Photo of the Colorado River in Glen Canyon, Amphitheater to Mystery Canyon section, taken by Alvin C...
Photo of crew on shore at Hidden Passage on the Colorado River in Glen Canyon, taken by Alvin Colvil...
Photo of the Colorado River in Glen Canyon, Amphitheater to Mystery Canyon section, taken by Alvin C...
Photo of Davy in Hidden Passage off the Colorado River in Glen Canyon, taken during Alvin Colville's...
Photo of Mystery Canyon off the Colorado River in Glen Canyon, taken during Alvin Colville's July 19...
Photo of Alvin bridging over a pool in Hidden Passage off the Colorado River in Glen Canyon, taken d...
Photo of Alex and Alvin in Hidden Passage off the Colorado River in Glen Canyon, taken during Alvin ...
Photo of the Colorado River below Hidden Passage in Glen Canyon, taken by Alvin Colville during a Ju...
Photo of the Colorado River below Hidden Passage in Glen Canyon, taken by Alvin Colville during a Ju...
Photo of the Colorado River below Hidden Passage in Glen Canyon, taken by Alvin Colville during a Ju...
Photo of the Colorado River below Hidden Passage in Glen Canyon, taken by Alvin Colville during a Ju...
Photo of Hidden Passage off the Colorado River in Glen Canyon, taken during Alvin Colville's July 19...
Photo of the entrance to Hidden Passage in Glen Canyon on the Colorado River, taken during Alvin Col...
Photo of crew in Hidden Passage off the Colorado River in Glen Canyon, taken during Alvin Colville's...
Photo of the Colorado River in Glen Canyon, Amphitheater to Mystery Canyon section, taken by Alvin C...
Photo of crew on shore at Hidden Passage on the Colorado River in Glen Canyon, taken by Alvin Colvil...
Photo of the Colorado River in Glen Canyon, Amphitheater to Mystery Canyon section, taken by Alvin C...
Photo of Davy in Hidden Passage off the Colorado River in Glen Canyon, taken during Alvin Colville's...
Photo of Mystery Canyon off the Colorado River in Glen Canyon, taken during Alvin Colville's July 19...
Photo of Alvin bridging over a pool in Hidden Passage off the Colorado River in Glen Canyon, taken d...
Photo of Alex and Alvin in Hidden Passage off the Colorado River in Glen Canyon, taken during Alvin ...
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