132 



WARMAN 

 1873. 



3. [Sketch of the geographic and geologic features of the 



Colorado Canyon and adjacent region.] 



In 42d Congress, 3d 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 In- 

 stitution, transmitting a report [by Professor Powell] of the 

 survey of the Colorado of the West and its tributaries, pp. 4, 

 8-14, Washington, D. C, 1873, 8°. The pamphlet consists 

 of 16 pp. Professor Powell's report is dated January 17, 1873. 

 In this report the valleys are classified in two orders. Ion.' 

 gitudinal 2iViA transverse^ and each of these in three varieties. 



4. Some remarks on the geological structure of a district 



of country lying to the north of the Grand Canon of the 

 Colorado; by J. W. Powell. 



In American Journal of Science and Arts for June, 1873, 

 3d series, vol. 5, pp. 456-465, New Haven, 1S73, 8°. Con- 

 tains the classification of valleys mentioned above. 



Issued separately, also, entirely reset; 8 pp., 8°. 



1874. 



5. [Summary of geographic and geologic data gathered, to 



date, in the Colorado Canyon and adjacent region.] 



In 43d Congress, ist session, House of Representatives, 

 mis. doc. No. 265, Professor Powell's report on the survey 

 of the Colorado of the West; letter from the Secretary of the 

 Smithsonian Institution, transmitting a report of Professor 

 Powell on the survey of the Colorado River of the West and 

 its tributaries, &c., &c., pp. 2-19, Washington, 1874, 8**. 

 The pamphlet consists of 29 pp., 8°. Professor Powell's 

 report is dated April 30, 1874. 



Appeared also in 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, 

 pp. 4-25, Washington, 1874, 8°. Pamphlet consists of 36 pp. 



6. Remarks on the structural geology of the valley of the 



Colorado of the West. 



In Philosophical Society of Washington, Bulletin, vol. 1, 

 pp. 48-51, Washington, 1874, 8°. An abstract. 



