Mineral resources of the Muggins mountains study area, Yuma County, Arizona / D.B.Smith,R.M.Tosdal,J.A.Pitkin и др., 1989. - V,16 p. p. - Текст : непосредственный.
Mineral resources of the Ragged top wilderness study area, Pima County, Arizona / G.A.Nowlan,J.A.Peterson,J.A.Pitkin и др., 1989. - 22 p. - Текст : непосредственный.
Mineral resources of the Arrastra Mountain/Peoples canyon wilderness study area La Paz, Mohave, and Yavapai counties, Arizona / F.Gray,R.J.Miller,J.A.Pitkin и др., 1989. - VI,E28 p. p. - Текст : непосредственный.