'Department of the Interior, United States Geological Survey. TEI-840.' 'Prepared in cooperation with the U.S. Atomic Energy Commission.' 'Contours in northwest Las Vegas Valley from Malmberg, 1961.' Relief shown by contours. Shows township and range lines. Scale [ca. 1:253,440. 1 in.=aprrox. 4 miles] (W 114°00´--W 115°00´--N 37°00´/N 36°00´). Originally published in A summary of the ground-water hydrology of the area between the Las Vegas Valley and the Amargosa Desert, Nevada : with special reference to the effects of possible new withdrawals of ground water / by Isaac J. Winograd, published by the U.S. Geological Survey in 1963 as number 840 of the Trace elements investigations report.

'F.V. Owen, publisher ... Los Angeles, California. Topography by C.H. Fenner, C.E. Decorations by L.J. Bergère. Gov't. data, H.A. Shamberger, C.E. Copyright, 1930, by F.V. Owen.' At bottom right of map: 'Dated Oct. 7th, 1930.' Relief shown by contours and spot heights. Contour lines are 100 feet. Incudes six hand-colored illustrations showing local points of interest. Includes information on Hoover Dam, and chart of mileages from Las Vegas. Scale [ca. 1:63,360]. 1 inch to 1 mile