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Num Mark Subjects (1-2 of 2) Year Entries
3 Found
1 River surveys.   2
2 River surveys -- Colorado River (Colo.-Mexico) -- History -- 20th century : Damming Grand Canyon : the 1923 USGS Colorado River expedition / Diane E. Boyer and Robert H. Webb ; U.S. Geological Survey ; foreword by Michael Collier  2007 1
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