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Explorations And Surveys South Of Central Pacific R.R. War Department 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 Lieutenant D.A. Lyle, 2nd U.S. Artillery During the Summer and Fall of 1871. Louis Nell. Chief Topographer and Draughtsman. Explorations in Nevada and Arizona. U.S. Engineer Department. AM. Photo-Lithographic Co. N.Y. (Osborne Process).
who: Wheeler, G.M.; U.S.; Lockwood, D.W.; Lyle, D.A.; Nell, Louis; American Photo-Lithographic Co.
what: National Atlas; Atlas Map
when: 1871
where: Nevada; Arizona
Map showing routes of the river and land parties engaged in exploring the Grand Canon of the Colorado. Under the command of 1st. Lieut. Geo. M. Wheeler, Corps of Engineers, U.S. Army. 1871. P.W. Hamel and L. Nell, topographers. Issued Feb. 4th 1878. The Graphic Co. Photo-Lith., 30 & 41 Park Place, N.Y. Weyss, Thompson & Lang del. By order of the Honorable the Secretary of War. Under the direction of Brig. Gen. A.A. Humphreys, Chief of Engineers, U.S. Army. (in upper margin:) United States Geographical Surveys West of the 100th Meridian. (1889)
who: Wheeler, G.M.; Hamel, P. W.; Nell, Louis; U.S.; Graphic Co. Photo-Lith.; Weyss, John E.; Thompson, Gilbert; Lang
what: Exploration Book; Atlas Map
when: 1889
where: Arizona; Grand Canyon (Ariz.)
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