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In 1902 the passage of the Reclamation Act and its mandate for the federal government to build dams for irrigation in the West created a need for accurate topographical surveys and geological studies of the rivers where the dams would be built. By 1920 the U.S. Geological Survey (USGS) and other agencies had surveyed the easily accessible stretches of the Colorado River and its main tributaries. The remaining segments had yet to be charted because...
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Practically a second volume of the author's "Romance of the Colorado river". cf. Pref. The only detailed account of the second descent of the Colorado river under the leadership of J. W. Powell. The narrative of the first Expedition of 1869 was published by the Smithsonian institution in 1875 in a report issued under title: Exploration of the Colorado river of the West and its tributaries.
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