Washington, D. C, March 1, 1880. 

 Sir: I have the honor to transmit herewith the manuscript of the 

 Report on the Geology and Resources of the Bhick Hills of Dakota, placed 

 in my hands for revision. 



I am, with respect, your obedient servant, 



G. K. GILBERT. 

 Maj. J. W. Powell, 



In charge U. S. G. and G. Survey, B. M. M., Washington, D. C. 



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