Mineral resources of the Mount Wilson Wilderness study area, Mohave County(Az) / R. C. Greene, R. G. Eppinger, J. R. Hassemer, 1989. - V,18 p. p. - Текст : непосредственный.
Mineral resources of the Swansea Wildernes Study Area, La Paz and Mohave Counties, Arizona / R.M.Tosdal,R.G.Eppinger,H.R.Blank и др., 1990. - VI, 24 p. 24 p. - Текст : непосредственный.
Mineral resources of the Gibraltar Mountain and Planet peak wilderness study areas, La Paz County,Arizona / R.G.Eppinger,J.A.Peterson,H.R.Blank и др., 1990. - VI,B32 p. p. - Текст : непосредственный.