12 CONTENTS. 
. CHAPTER ۰ 
Explorations from A. D. 1852 to A. D. 1851. 
Gov. I. I. Stevens and Capt. G. B. McClellan, U. S. E., exploration and survey for a railroad route, 1853-'54-' 55.—Lieut. 
R. Arnold, U. S. A., survey, 1854.—F. W. Lander, C. E, reconnaissance, 1854.—Capt. G. W. Gunnison, T. E., and 
Capt. E. G. Beckwith, U. S. A., exploration and survey for a railroad route, 1853.—Capt. E. G. Beckwith, U. S. A., 
exploration and survey for a railroad route, 1854.— Capt. A. W. Whipple, T. E., exploration and survey for a rail- 
road route, 1853-'54.—Lieut. R. S. Williamson, T. E., survey for a railroad route, 1853-’54.—Lieut. J. G. Parke, T. 
E., exploration and survey for a railroad route, 1854.— Capt. J. Pope, T. E., exploration and survey for a railroad route, 
1854.—Lieut. J. G. Parke, T. E., exploration and survey for a railroad route, 1854-’55.—Lieut. R. S. Williamson, T. E., 
and Lieut. H. L. Abbott, T. E., exploration and survey for a railroad route, 1855.—Major W. H. Emory, U. 8. A., 
United States and Mexican boundary survey, 1849 to 1855.— Capt. J. L. Reno, U. S. A., survey, 1853.—Capt. R. B. 
Marcy, U. S. A., exploration, 1854.—Alexander Boss, ‘‘ fur hunters of the far west," 1855.— March of Colonel Steptoe’s 
command to California, 1854-'55.—Lieut. J. Withers, U. S. A., survey of road, 1854.— Lieut. G. H. Derby, T. E, survey 
of roads, 1854-'55.—Lieut. G. H. Mendell, T. E., reconnaissance, 1855.— Capt. J. H. Simpson, T. E., survey of roads, 
1855.—Lieut. G. K. Warren, T. E , reconnaissance, 1855.—Lieut. F, T. Bryan, T. E., reconnaissance, 1855.— Lieut. J. 
C. Amory, U. S. A., reconnaissance in 1855.—Major Merrill, U. S. A., reconnaissance, 1855.—Lieut. I. N. Moore, U. 
S. A., map of part of New Mexico, 1855.—Lieut. E. L. Hartz, U. S. A., reconnaissance, 1856.—Lieut. F. T. Bryan, T. 
E., survey of road, 1856.— Capt. J. H. Dickerson, U. S. A., survey of road, 1856.— Lieut. W. D. Smith, U. S. A., recon- 
- naissance of route, 1856.— Capt. A. Sully, U. S. A., reconnaissance, 1856.—Lieut. G. K. Warren, T. E., reconnaissance 
of Missouri and Yellowstone, 1856.—Explorations ordered in 1857. 
CHAPTER V. 
Method of compiling the map, with list of principal determinations of longitude. 
CHAPTER VI. 
General remarks upon the topography of the region west of the Mississippi river. 
