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67293-Thumbnail Image.png
Created1986-04
Description

Cooperative National Park Resources Studies Unit for University of Arizona, effects on Glen Canyon Dam releases on Grand Canyon River trips, a technical report, vol. no. 16.

67283-Thumbnail Image.png
ContributorsU.S. Dept. of the Interior (Publisher)
Created1964-09-26
Description

A pamphlet on Bridge and Marble Canyon Dams and their relationship to Grand Canyon Natinal Park and Monument.