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1968. Holden, P.B. Systematic studies of the genus Gila (Cyprinidae) in the Colorado River basin. M.S. Thesis, Utah St. Univ., Logan. 74 p. (Not seen). Presumably forms much of the basis for the work published by Holden and Stalnaker (1970)(see below), though - not cited therein. 1968. Minckley, W.L., and N.T. Alger. Fish remains from an achaeological site along the Verde River Yavapai County, Arizona. Plateau 40:91-97. Discusses remains found in a cave near the Verde River referring them to Gila robusta and discusses osteological characters to distinguish this species from G. elegans and G. intermedia. 1969. Rinne, J.N. Cyprinid fishes of the genus Gila from the lower Colorado River basin. Unpub. M.S. Thesis, Ariz. St. Univ., Tempe. 77 p. (Not seen). Presumably forms much of the basis for the subsequent work on Gila spp. of this region (Rinne, 1976) (below) . 1969. Vanicek, C.D., and R.H. Kramer. Life history of the Colorado squawfish, Ptychocheilus lucius, and the Colorado chub, Gila robusta, in the Green River in Dinosaur National Monument, 1964-1966. Trans. Amer. Fish. Soc. 98:193-208. Provides an age and growth study of Gila spp. from the Green River (treating roundtail and bonytail as one species) which gives comparative insights into the growth regimes of these two forms. They were morphologically distinct at three years of age. The marked differences found in body-scale growth relationships could have taxonomic implications. 1970. Baxter, G.T., and J.R. Simon. Wyoming Fishes (3rd edit.). Bull. 4, Wy. Game & Fish Dept., Cheyenne. 168 p. Gives accounts for G. robusta and G. elegans treating the latter as full species based on the thesis work of Holden (1968)(above), thus being perhaps one of the first published accounts of this reelevation. Discusses distinguishing characters between the various forms of Gila. 1970. Holden, P.B., and C.B. Stalnaker. Systematic studies of the cyprinid genus Gila, in the upper Colorado River basin. Copeia 1970:409-420. 8