Surficial geologic map of Las Vegas Valley, Nevada, circa 1981

'United States Department of the Interior, Geological Survey. Open-file report, 84-130, plate 1.' 'Prepared in cooperation with the Clark County Department of Comprehensive Planning.' 'Base from U.S. Geological Survey 1:100,000, Boulder City, Ariz.-Nev., Las Vegas, Nev.-Calif., Mesquite Lake, Nev.-Calif., 1978, Lake Mead, Nev.-Ariz., 1979.'Geology from Malmberg (1965); Longwell and others (1965); Haynes (1967); Bingler (1977); Bell and Smith (1980); Bell (1981); Matti and Bachhuber (1982); and Matti and Morton (1982a and b); modified by R. W. Plume, 1981.' Shows township and range lines. Scale [ca. 1:102,960. 1 in.=approx. 1.625 miles] (W 115°30´--W 115°00´/N 36°30´--N 36°00´). Series: Open-file report (Geological Survey (U.S.))84-130. Originally published as plate 1 of Ground-water conditions in Las Vegas Valley, Clark County, Nevada. Part I. Hydrogeologic framework / by Russell W. Plume, published by the U.S. Geological Survey in 1984 as Open-file report 84-130.