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Show 225 pom tbe reports and maps of Pope, 1 Whipple, 2 and Marcy ; 3 the valley m the Canadian, from Whipple: 2 that of the Arkansas, from Emory, 4 Bironison, 5 and the Arkansas Valley Railroad: the Kansas River and Smoky Hill Fork, from the Kansas Pacific Bailroad; the Valley of the Bepublican, from Fremont6 and Stansbury; 7 that of the Platte, from [ tbe Union Pacific Bailroad. Information concerning the Missouri Biver lod the country lying between that river and the Black Hills is derived mom the work of Warren, 8 Baynolds, 9 and Ludlow. 10 Stevens11 gives much information concerning the country east of the Missouri, and the Northern Pacific Bailroad furnishes a profile across it. Facts and fig-ires concerning the plains of the Upper Missouri come mainly from Bterens. 11 The divides between the valleys have been crossed in many places, jsnd profiles made, and in no place do they show much rise above the Tallejs. The principal authorities consulted in regard to the Black Hills are the reports of Warren, 8 Baynolds, 9 Ludlow, 10 and Jenney's map. 12 Proceeding westward and entering the mountains, isolated elevations become of less value, while a knowledge of the general topographic features correspondingly increases in value. For a knowledge of the topographic features of New Mexico, I have consulted the reports of the United States expeditions which have crossed that Territory; principal among them are Emory, 4 Whipple, 2 Ives, 13 Parke, 14 and Simpson. 15 The mountain and plateau regions of Colorado are from tbe work, published and unpublished, of this Survey. The plateau country adjacent to the Green and Colorado Bivers is from the published, and, through the courtesy of the geologist incharge, the unpublished, work of the survey in charge of Maj. J. W. Powell. 16 The coantry of the Lower Colorado is known from Ives's17 report, aud the ' Pacific Railroad Reports, vol. ii. * Pacific Railroad Reports, vol. iii and iv. ' Exploration of Red River of Louisiana. Thirty- second Congress, second session, Executive Document No. 54. 4Notes of a Military Reconnaissance from Fort Leavenworth, Mo., to San Diego, Cal., by Maj. W. H. Emory, 1846-' 47. Thirtieth Congress, first session, Executive Document No. 7. 5Pacifio Railroad Report, vol. ii. { Report of the Exploring Expedition to the Rocky Mountains in the year 1842, and to Oregon and North California in the years 1843-' 44, by Brevet Capt. J. C. Fre'uiont. 7 Exploration and Survey of the Valley of the Great Salt Lake of Utah. Howard Stansbury. Special session, 1851, Senate Executive Document No. 3. / Reconnaissance of the Dakota Coantry, 1855. Thiity- fourth Congress, first session, Senate Executive Document No. 76. * Exploration of the YeUowstone River, by Brevet Brig. Gen. W. F. Raynolds, and geological Report, by Dr. F. V. Hayden. Fortieth Congress, first session, Senate Executive Document No. 77. 10 Report of a Reconnaissance of the Black Hills of Dakota in 1874, by Capt. William Ludlow. 11 Pacific Railroad Reports, vol. i and Supplement, and vol. xii, part i. '• Map of the Black Hills, W. P. Janney, 1875. 15 Report upon the Colorado River of the West, explored in 1857 and 1858, by Lieut. '• C. Ives. Thirty- sixth Congress, first session, Senate Executive Document. {* Pacific Railroad Report, vol. vii. l] Report of an Expedition into the Navajo Country, by Lieut. J. H. Simpson, 1849. Thirty- first Congress, first session, 8enate Executive Document No. 64. l" Exploration of the Colorado River of the West, in 1869- 72, by J. W. Powell. , r Report upon the Colorado River of the West, explored in 1857 and 1858, by Lieut. ' C. Ivta. Thirty- sixth Congress, first session, Senate Executive Document. |