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"Map No. 2 of the El Paso &amp;amp; Fort Yuma Wagon Road. J.B. Leach, Superintendent. Made under the direction of N.H. Hutton, Chief Engr. Assisted by G.C. Wharton, Prinl. Asst. Engr. W.D. Cress and P.G. Hume, Assts. 1857-8. Thos. S. Wagner&#39;s Lith. Philada. Dept. of the Interior, Pacific Wagon Roads...."
<https://www.historicpictoric.com/products/historic-map-no-2-el-paso-fort-yuma-wagon-road-1858-vintage>