Mineral resources of the Sierra Estrella Wilderness study area, Maricopa County, Arizona / W. J. Keith, R. J. Goldfarb, V. L. Bankey, 1989. - V,14 p. p. - Текст : непосредственный.
Mineral resources of the Camp Creek and Cottonwood Creek wilderness study areas, Malheur County, Oregon / W.J.Keith,R.L.Turner,A.Griscom и др., 1989. - 16 p. - Текст : непосредственный.