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Subjects
Arizona, Life Sciences - Botany, Repeat photography, Science, Science/Mathematics, Vegetation dynamics, 20th century, Agriculture - General, Arizona, description and travel, Biography, Botany, united states, Colorado River (Colo.-Mexico), Colorado river and valley, description and travel, Dams, Description and travel, Desert ecology, Ecology, 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)Time
20th centuryID Numbers
- OLID: OL2727624A
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April 29, 2008 | Created by an anonymous user | initial import |