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Minckley, C.O. 1980. Recovery of the humpback chub, Gila c a, and observations on that species, 1977-1978. Proc. Desert Fishes Coun. 10 (1978):40. Discusses results indicating a large population of humpback chubs in the lower Little Colorado River area and states that the range of this chub had been extended in the main Colorado to "river mile 194" (miles below Lee's Ferry). Minckley, C.O. 1985. A summary of observations on the humpback chub (Gila cypha) in the Grand Canyon Region. Proc. Desert Fishes Council 13(1981):80-81. States that range of humpback chub in Grand Canyon area is from "Lake Powell to river mile 194" and speculates some occurrence in upper Lake Mead. Smith, G.R. 1959. Annotated check list of fishes of Glen Canyon; pp. 195-199, in: A.M. Woodbury et al., Ecological studies of the flora and fauna in Glen Canyon. Univ. Utah Anthro. Pap. 40. 226 p. Provides preipoundment records for Glen Canyon-Lake Powell area. Unfortunately, probably due to limited collecting methods, only three small Gila specimens were collected. One tentatively identified as robusta was from Aztec Creek; other two were unidentifiable. Stone, J.L., and N.L. Rathbun. 1969. Tailwater fisheries investigations, creel census and limnological study of the Colorado River below Glen Canyon Dam. Ariz. Game & Fish Dept. Rpt. 35 p. Reports both Gila cypha and G. elegans as "common" in Glen Canyon Dam tailwater in 1968-69. Average lengths (12-1311) given for these fish would indicate that all were several years old. Suttkus, R.D., and G.H. Clemmer. 1979. Fishes of the Colorado River in Grand Canyon National Park. U.S. Nat. Park Serv. Trans. & Proc. Ser. 5:599-604. Records G. cypha in and Little Colorado from River Mile 44 were recorded from taken in the Paria the Canyon area from Shunumo Creek River mouths, and few juvenile specimens downstream to RM 109. No other Gila spp. the Colorado River and no Gila spp. were River which was also sampled. 33