UNITED STATES GEOGRAPHICAL AND GEOLOGICAL SURVEY OF 

 THE ROCKY MOUNTAIN REGION (POWELL). 



EARLY REPOiRTS BY J. W. POWELL. « 



Forty-second Congress, second session, House of Representatives, 

 Mis. Doc. No 173. Survcj' of the Colorado River of the West. 

 Letter from the Secretarj^ of the Smithsonian Institution, transmitting 

 report preliminary for continuing the survey of the Colorado of the 

 West and its tributaries, l)y Professor Powell. April 5, 1S72. — 

 Referred to the Committee on Appropriations and ordered to be printed. 



8°. 12 pp. 



Forty-second Congress, third session. House of Representatives, 

 Mis. Doc. No 76. Report of the survey of the Colorado of the West. 

 Letter from the Secretary of the Smithsonian Institution, transmitting 

 a report of the survey of the Colorado of the West and its tributaries. 

 January 31, 1873. — Referred to the Committee on Appropriations and 

 ordered to be printed. 



8°. 16 pp. 



Forty-third Congress, first session, House of Representatives, Mis. 

 Doc. No 265. Professor Powell's Report on the surve}^ of the Colorado 

 of the West. Letter from the Secretary of the Smithsonian Institu- 

 tion, transmitting a report of Professor Powell on the survey of the 

 Colorado River of the West and its tributaries, etc., etc. May 2, 

 1874. Referred to the Committee on Appropriations and ordered to 

 be printed. 



8°. 29 pp. 



Report of explorations in 1873 of the Colorado of the West and its 

 tributaries, by Professor J. W. Powell, under the direction of the 

 Smithsonian Institution. Washington: Government Printing Office. 



1874. 

 8°- 36 pp. (Same as Houae Mis Doc. 265, 43d Oong., 1st sess.). 



Exploration of the Colorado River of the West and its tributaries. 

 Explored in 1869, 1870, 1871, and 1872, under the direction of the 

 Secretary of the Smithsonian Institution. [By J. W. Powell.] Wash- 

 ington: Government Printing Office. 1875 



4°. xi, 291 pp., 2 11., 72 illustrations. 



a These reports were issuerl before the Powell survey was organized, but they are preliminary to 

 the publications of that organization. 



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