UNITED STATES GEOGRAPHICAL SURVEYS WEST OF THE ONE 

 HUNDREDTH MERIDIAN (WHEELER). 



ANNUAL REPORTS. 

 1869. 



, Eng-ineer Department, U. S. Arm}-. Preliminary report upon a 



reconnaissance through southern and southeastern Nevada, made in 



1869, by First Lieut. Geo. M. Wheeler, Corps of Engineers, U. S. 



Army, assisted by First Lieut. D. W. Lockwood, Corps of Engineers, 



U. S. Army, under the orders of Brig. Gen. E. O. C. Ord, Bvt. Maj. Gen. 



U. S. Army, commanding Department of California. Washington: 



Government Printing Office. 1875. 



4°. 72 pp. 



1871. 



Preliminarj' report concerning explorations and surveys principally 

 in Nevada and Arizona. Prosecuted in accordance with paragraph 2, 

 special orders No. 109, War Department, March IS, 1871, and letter of 

 instructions of March 23, 1871, from Brig. Gen. A. A. Humphreys, 

 Chief of Engineers. Conducted under the immediate direction of 1st 

 Lieut. George M. Wheeler, Corps of Engineers. 1871. Washington: 

 Government Printing Office. 1872. 



4°- 96 pp., 1 map. 



[Progress report], pp. 11-62. 



Appendix A. Report of Daniel W. Lockwood, First Lieutenant of Engineers, 



pp. 62-76. 

 Appendix B. Report of Second Lieutenant D. A. Lyle, United States Artillery, 



pp. 76-90. 

 Appendix C. Report of Edward P. Austin, astronomical assistant, pp. 91-92. 

 Appendix D. Report of G. K. Gilbert, geological assistant, pp. 92-96. 



1872. 



Engineer Department, United States Army. Progress report upon 

 geographical and geological explorations and sur\eys west of the one 

 hundredth meridian, in 1872, under the direction of Brig. Gen. A. A. 

 Humplireys, Chief of Engineers, United States Armj-, by Fii'st Lieut. 

 George M. Wheeler, Corps of Engineers, in charge. Washington: 

 Government Printing Office. 1874. 

 4°. 56 pp., 5 pis. and 1 map. 



[Progress report], pp. 7-43, pla. i-v, map. 



Appendix A. Preliminary astronomical report, by John H. Clark, a.stronomical 

 assistant, pp. 44—1.5. 

 44 



