JOHN WESLEY POWELL I43 



51. The lesson of Conemaugh. By Major J. W. Powell, Di- 



rector of the United States Geological Survey. 



In North American Review for August, 1S89, vol. 149, pp. 

 150-156, New York, 1S89, 8". 



1890. 



52. Statement of Maj. J. W. Powell, Director of the Geological 



Survey [in relation to irrigation in the United States] . 



In Hearings before Select Committee on Irrigation, House 

 of Representatives, Fifty-first Congress, on the General Sub- 

 ject of Irrigation in the United States, pp. 4-5, 16-29 (Feb- 

 ruary 6, 1S90), pp. 1-90, 104-116 (February 37, 1S90), 

 Washington, 1S90, 8°. 



Two pamphlets, with similar titles, the one dated February 

 6 consisting of 38 pp. ; that of February 27, 134 pp. 



Largely interlocutory. The testimony covers a wide field. 

 "Artesian irrigation on the Great Plains," pp. 71-90. 



Reprinted in No. 60. 



53. The irrigable lands of the arid region. By Major J. W. 



Powell, Director of the U. S. Geological Survey. 



In Century Illustrated Monthly Magazine for March, 1890, 

 vol. 39, pp. 766-776, New York, 1890, 8°. Map show- 

 ing principal drainage districts of the arid region. 



A long extract appeared in Public Opinion of March i, 

 1890. 



54. The non-irrigable lands of the arid region. By the 



Director of the United States Geological Survey. 



In Century Illustrated Monthly Magazine for April, 1890, 

 vol. 39, pp. 915-932, New York, 1890, S° . Map of the 

 forest lands of the arid region. 



55. Institutions for the arid lands. 



In Century Illustrated Monthly Magazine for May, 1890, 

 vol. 40, pp. 111-116, New York, 1890, S° . 



56. [Data relating to the irrigation problem in western United 



States.] 



In United States Geological Survey, Tenth Annual Report, 

 Part II, passim, Washington, 1890, royal 8°. 



No. 49 reprinted on pp. 16-29. 



