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Subjects
20th century, Arizona, Arizona, description and travel, Biography, Colorado River (Colo.-Mexico), Colorado river and valley, description and travel, Dams, Description and travel, Environmental conditions, Expeditions & Discoveries, Geological Survey (U.S.), Grand Canyon Region, Grand canyon (ariz.), History, History - U.S., History / United States / State & Local / Southwest (AZ, NM, OK, TX), History: American, Political aspects, Political aspects of Water-supply, River surveys, United States - 20th Century/20s, United States - State & Local - Southwest, Water resources development, Water-supply, Water-supply, mexicoTime
20th centuryID Numbers
- OLID: OL2948997A
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April 29, 2008 | Created by an anonymous user | initial import |