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Continue to ChatReport of an Expedition Down the Zuni and Colorado Rivers, by Captain L. Sitgreaves (United States. Army. Corps of Topographical Engineers) http://www.johnjasonfallows.com/2018/01/26/report-of-an-expedition-down-the-zuni-and-colorado-rivers-by-captain-l-sitgreaves-united-states-army-corps-of-topographical-engineers/