Hand-drawn, hand-colored and annotated map showing the 280 foot level of the Combination Mine. Printed on map: 'Mohawk, col. el. 5958.48; Hayes & Monnette No. 2, col. el. 5935.7; Hayes & Monnette No. 1, col. el. 5925.8; Truett, col. el. 5938.8; Combination, col. el. 5986.31.'

At top of map: 'United States Department of the Interior. Geological Survey. Open-file report 84-130, plate 5.' 'Prepared in cooperation with the Clark County Department of Comprehensive Planning.' At bottom of map: '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); Bell and Smith (1980); Bell (1981) and J. R. Harrill, 1976. Thickness of valley-fill deposits by R.W. Plume, 1981.' Includes three profiles. Shows township and range lines. Scale [ca. 1:95.040. 1 in.=approx. 1.5 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 5 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.