UNITED STATES GEOGRAPHICAL AND GEOLOGICAL SURVEY OF 

 THE ROCKY MOUNTAIN REGION (POWELL). 



EARLY^ REPORTS BY J. W. POWELL." 



Fort3'-second Congress, second session, House of Representatives, 

 Mis. Doc. No 173. Surve}^ of the Colorado River of the West. 

 Letter from the Secretar3'of the Smithsonian Institution, transmitting 

 report preliminary for continuing the survey of the Colorado of the 

 West and its tributaries, ])y Professor Powell. April 5, 1872. — 

 Referred to the Committee on Appropriations and oi-dered to be printed. 



8°. 12 pp. 



Fortv-second Congress, third session, House of Representatives, 

 Mis. Doc. No 7G. Report of the survej' 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 "\A'est and its tril)utaries. 

 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 !>fi5. 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 surve}" of the 

 Colorado River of the West and i,ts tributaries, etc., etc. Ma}^ 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. PoAvell, under the direction of the 

 Smithsonian Institution. Washington: Government Printing Office. 

 1871. 



8°. 36 pp. (Same as House Mis Doc. 265, 43d Cong., 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. [B}^ J. W. Powell.] Wash- 

 ington: Government Printing Office. 1875 



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



aThese reports were issnerl before the Powell survey was organized, but they arc preliminary to 

 the publications of that organization. 



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