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Requiem for the Santa Cruz : an environmental history of an Arizona river by Webb, Robert H., Betancourt, Julio L., Johnson, R. Roy (Raymond Roy), 1932-, Turner, R. M. (Raymond M.)
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Damming Grand Canyon : the 1923 USGS Colorado River expedition by Boyer, Diane E.
Published 2007Other Authors: “…Webb, Robert H.…”
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Repeat photography : methods and applications in the natural sciences
Published 2010Other Authors: “…Webb, Robert H.…”
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repeat photography