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Show 22 diversion cannot be made between the foot of the lower Grand Canon and the junction of its confluents, the Green and Grand Eivers. I most respectfully suggest the desirability of entering such portions of the following areas for the season of 1876 as shall seem most practicable at the time that detailed projects shall be required to be submitted : For the Pacific coast section of the survey, the unfinished portions of sheets Nos. 72 and 73; No. 80, 64 ( C), 64 ( D), 48 ( C), 48 ( D) ,• for the Rocky Range section, the unfinished parts of Eos. 77 and 78 5 also portions of 84 ( B), and 85 ( A), 53 ( A), 52 ( A), ( B), 52 ( C), 51 ( B), 51 ( D), 24 ( C), 24 ( D), 33, 34, 35 ( A), 35 ( C), 42 ( A), 42 ( B), 43 ( A), 43 ( B), 44 ( A), 44 ( C). These areas, one and all, are easily connected with initial points already established, and represent sections into which mineral aud other industries are most rapidly entering. PROGRESS- MAP. This map, skeleton in its character, and of approximate accuracy only as to its several lines and positions, has been revised to date. There is not claimed for this map the novelty and thoroughness of a compilation, as it is simply a reduction, to which has been added a little new material, drawn principally from this survey, of what is known as the Western Territory Map of the Engineer Department, originally compiled under the direction of Lieut. G. K. Warren, Topographical Engineers, iu the years 1854-' 58. The skeleton- map, a reduction also from the Western Territory Map, prepared to accompany the Progress Report of 1S72, was constructed in great haste, to meet any call that might be made for preliminary information, as further appropriations had been asked. It was perfected, primarily, to show the scheme proposed for a series of topographical atlas- maps of the area west of the one-hundredth meridian, and the progress of that work, to include the area entered during the season of 1872. Having answered most of the purposes for which it was intended, it was replaced by the present uProgress Map," more complete in all its characteristics. So far as information can be obtained, the extensions of railroad and telegraph lines are represented; but as no Department of the Government is the custodian of fully reliable information upon this subject, the information has, per force, been sought from various sources; hence an uncertainty as to its completeness. NOTE.- The designations ( A), ( B), ( C), and ( D), respectively, have been given to the northwest, northeast, southwest, and southeast quarters of each atlas- sheet, as shown upon rectangles 52, ( 31, 69, 77,78, 72, and 73 of the progress- map. ROUTES AND PROFILES. In response to a letter from the commanding officer of Fort Cameron, Utah, to Bvt. Maj. Gen. E. O. C. Ord, while in command of the Department of the Platte, by whom it was referred, through the Chief of Engineers, to this office, a report was made upon the different routes discovered from the vicinity of Port Cameron, Utah, to the southward, crossing the Colorado River and ending at Prescott, Ariz. That report is not now available; but the tables of distances from Beaver, lying to the westward of Fort Cameron and Salt Lake, via several routes, all ending at Prescott, are herewith. |