Genre/Form: Topographic map. Scale 1:96,000 (W 115°30´--W 114°45´/N 36°30´--N 36°00´). 1 map ; 58 x 70 cm. Series: Water-supply paper (Washington, D.C.) ; 1780. Relief shown by contours. "After C.R. Longwell (written communication, 1954, fig. 30)." Originally published as plate 12 of Available water supply of the Las Vegas ground-water basin, Nevada, by Glenn T. Malmberg, published by the Geological Survey in 1965 as its Water-supply paper 1780. Includes township and range lines. Interior, Geological Survey