Airborne remote sensing for geology and the environment-present and future / Ed.: K. Watson, D. H. Knepper, 1993. - 43 p. - Текст : непосредственный.
Mineral resources of the Wabayuma Peak Wilderness Study Area, Mohave County, Arizona / C.M.Conway,J.R.Hassemer,D.H.Knepper и др., 1990. - VIII,52 p. p. - Текст : непосредственный.
Mineral resources of the Woolsey Peak Wilderness study area, Maricopa county, Arizona / J.A.Peterson,J.R.Hassemer,D.H.Knepper и др., 1989. - V,16 p. p. - Текст : непосредственный.