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19 <br />Valdez, R.A., P.G. Mangan, R.P. Smith, and B.C. Nilson. 1982. Upper Colorado <br />River investigation (Rifle, Colorado to Lake Powell, Utah). U.S. Fish <br />and Wildlife Service and Bureau of Reclamation, Final Report, Part 2, <br />Colorado River Fishery Project, Salt Lake City, Utah. <br />Valdez, R.A., and W.J. Masslich. 1989. Winter habitat study of endangered <br />fish - Green River. Bureau of Reclamation, Salt Lake City, Utah. <br />178 pp. <br />Vanicek, C.D., and R.H. Kramer. 1969. Life history of the Colorado squawfish <br />Ptvchocheilus Lucius and the Colorado chub Gila robusta in the Green <br />River in Dinosaur National Monument, 1964-1966. Transactions of the <br />American Fisheries Society 98(2):193. <br />