The conterminous United States Mineral Assessment Program : Background information to accompany folio of geologic,geochemical,remote sensing,and mineral resources maps of the Butte 1o x 2o quadrangle,Montana / J.E.Elliott,C.M.Trautwein,C.A.Wallace и др., 1993. - 17 p. - Текст : непосредственный.
Mineral resource assessment of the dillon 1 X 2 quadrangle,Idaho and Montana / R.C.Pearson,C.M.Trautwein,E.T.Ruppel и др., 1992. - III,15 p. p. - Текст : непосредственный.