144 THE U. S. GEOLOGICAL SURVEY 



6 1 U. S. Geological Survey. Fuels and structural ma- 

 terials. Letters from the Secretary of the interior, 

 transmitting a copy of a letter from the Director of 

 the Geological survey embodying a summary of the 

 results obtained in the investigations under the survey 

 of fuels and structural materials at the testing plants 

 at St. Louis, etc. . . . [Washington, Govt, print, off., 

 1906] 14 p. (59th Cong., 1st sess. Senate. Doc. 214) 



Serial no. 4913 



62 Nature and uses of the topographic maps 



of the United States Geological survey. [Washing- 

 ton, Govt, print, off., 1908] 4 p. 



63 The State geological surveys of the United 



States, comp. under the direction of C. W. Hayes. 

 Washington, Govt, print, off., 191 1. 177 p. (Bulletin 

 no. 465) 

 64 Statement of purposes and results of in- 

 vestigations and tests of fuels and structural material, 

 showing bearing on conservation of mineral resources. 

 May 4, 1908. Washington, Govt, print, off., 1908. 

 14 p. (60th Cong., 1st sess. Senate. Doc. 460) 



Serial no. 5265 



65 Statement of the Director of the Geological 



survey regarding the desirability of a more extensive 

 recognition of the mining industry by governmental in- 

 quiry. [Washington, Govt, print, off., 1908] 7 p. 



[Favors establishment of a mining technology branch in the 

 Geological survey, or an independent bureau of mining 

 technology, to supplement the geologic work of the Survey 

 in behalf of the mining industry] 



66 Testing of fuels and structural materials 



for the United States. [Washington, Govt, print, off., 



1907] 8 p. 

 67 The United States Geological survey: its 



origin, development, organization, and operations. 



Washington, Govt, print, off., 1904. 205 p. (Bulletin 



no. 227) 



[Includes account of the. United States survey prior to estab- 

 lishment of Geological survey] 



