Mineral resources of Eight Wilderness study areas bordering zion National Park, Washington and Kane counties, Utah / R.E. van Loenen,E.G.Sable,H.R.Blank и др., 1989. - 23 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.
Mineral resources of the Tabeguache Creek wilderness study area, Montrose County, Colorado / R.P.Dickerson,H.N.Barton,H.R.Blank,D.C.Scott, 1989. - V,15 p. p. - Текст : непосредственный.