'Preliminary topographical map embracing in skeleton a portion only of the notes from surveys made in accordance with Par.II Special Orders No. 109 War Dept., March 18th, 1871 and letter of instructions of Brig. General A.A. Humphreys, Chief of Eng'rs. dated March 23rd, 1871. Conducted under the immediate direction of 1st Lieutenant Geo. M. Wheeler, Corps of Eng'rs., assisted by 1st Lieutenant D.W. Lockwood, Corps of Eng'rs. and 2nd Lieutentant D.A. Lyle, 2nd U.S. Artillery, during the summer and fall of 1871. Louis Nell, chief topographer and draughtsman.'' At head of map: 'Explorations in Nevada and Arizona. U.S. Engineer Department.' In lower left corner: 'Note: This map is a hasty and partial compilation from the topographical data already received, many still remaining en route. Upon it is projected in skeleton the groundwork of the area examined. All points except the prominent astronomical positiions are subject to lsight modification upon the final map.' Shows area through central Nevada, eastern California, and central Arizona. Relief shown by hachures. Published by the War Dept. Scale [ca. 1:1,520,640]. 1 in. to 24 miles (W 118°--W 109°/N 41°--N 32°).

Scale [ca. 1:274,349. 1 in. to approx. 4.33 miles] (W 114°54?--W 113°54?/N 36°36?--N 35°58?). 1 map ; 27 x 34 cm. United States Dept. of the Interior, Geological Survey

'U.S. Department of Agriculture, Bureau of Chemistry and Soils; C.A. Browne, Acting Chief; Curtis F. Marbut, in charge, Soil Survey.' 'Macy H. Lapham, Inspector, District 5. Soils surveyed by F.O. Youngs, in charge, and E.J. Carpenter.' 'Field Operations, Bureau of Soils, 1923.' 'A, Hoen & Co. Lith. Baltimore, Md.' Shows township and range lines. Scale [1:63,360]. 1 in. = 1 mile (W 114°45´--W 114°18´/N 36°51´--N 36°24´). Library's copy has hand-written notes and has hand-drawn maps and notes on verso.

Transcribed from the original: 'Made in 1851 under the direction of Col J.J. Abert, Chief of Corps Topographical Engineers, by BVT. Capt. L. Sitgreaves, T.E., assisted by Lieut. J.G. Parke, T.E., and Mr. M.H. Kern. Drawn by R.H. Kern, 1852.' 'Gila River from a reconnaissance by Maj. Emory, Topographical Engrs. Colorado River below Camp Yuma from a reconnaissance by Lt. Derby Topographical Engrs.' Shows Indian villages and forts. Upper right corner partially missing. Scale [ca. 1:650,000]. Scale of 10 miles to one inch.' 'Ackerman Lith.: 379 Broadway, N.Y.'

31 x 39 cm. Relief shown by hachures and spot heights. "Entered in Sta. Hall London & according to act of Congress in the year 1857 by H.D. Rogers in the Clerks Office of the District Court of Massachusetts." Includes proposed Pacific railway routes. In upper margin: Atlas of United States &c., 13. Original publisher: John Murray, Scale: 3,450,000 of nature, 54 1.

'At top of map: ' United States Department of the Interior. Geological Survey.' ' Bulletin 1021, Plate 32.' At bottom of map: 'Geology by Donald E. Hibbard and Mike S. Johnson, 1952.' 'Base from USAF Aeronautical Chart and Information Service, April 1952.' 'Interior--Geological Survey, Washington, D.C. MR-3767.' Scale 1:63,360 (W 116°10--W 115°55/N 37°15--N 36°40)
Geological Survey bulletin, 1021

'T.E. Eakin, S.L. Schoff, and P. Cohen, 1963.' 'Department of the Interior, United States Geological Survey, TEI-833.' 'Prepared in cooperation with the U.S. Atomic Energy Commission.' Scale 1:500,000 (W 117°00´--W 115°00´/N 38°30´--N 36°30´). Originally published as figure 3 in Regional hydrology of a part of southern Nevada : a reconnaissance / by Thomas E. Eakin, Stuart L. Schoff, and Philip Cohen, published by the U.S. Geological Survey in 1963 as number 833 of the Trace elements investigation report.