Mineral resources of the Black Mountains North and Burns Spring Wilderness Study Areas,Mohave County,Arizona / J.E.Conrad,R.H.Hill,R.C.Jachens,J.T.Neubert, 1990. - 22 p. - Текст : непосредственный.
Mineral resources of the Sierra Ladrones Wilderness study area, Socorro County, New Mexico / S.L.Moore,M.S.Allen,C.L.Long,J.T.Neubert, 1989. - 17 p. - Текст : непосредственный.