138 THE U. S. GEOLOGICAL SURVEY 



report of the National academy of sciences. Jan. 13, 

 1879. [Washington, Govt, print, off., 1879] 17, 5 p. 

 (45th Cong., 3d sess. Senate. Ex. doc. no. 21) 



Serial no. 1828 



31 U. S. War dept. Lieutenant Wheeler's geographical sur- 

 veys. Letter . . . relative to the continuance of the 

 geographical explorations and surveys west of the one 

 hundredth meridian. [Washington, Govt, print, off., 

 J 875] 3 p. (43d Cong., 2d sess. House. Ex. doc. no. 

 109) Serial no. 1648 



32 Reports of explorations and surveys to as- 

 certain the most practicable and economical route for 

 a railroad from the Mississippi River to the Pacific 

 Ocean, made under the direction of the secretary of 

 war in i853-[6] Washington, G. O. P. Nicholson, 

 printer, 1855-1860. 12 v. in 13. plates, maps. [Vols. 

 1:11: 33d Cong., 2d sess. House. Ex. doc. no. 91. 

 Vol. 12, pts. 1-2: 36th Cong., 1st sess. House. Ex. 

 doc. no. 56. Serial no. 791-801, 1054-1055. 

 The reports of the Pacific railroad surveys were pre- 

 pared under supervision of the Engineer department] 



33 Surveys by the War department. Letter 



. . . giving information concerning the surveys con- 

 ducted by the department in the last ten years. May 



10, 1878. [Washington, Govt, print, off., 1878] 8 

 p. fold. map. (45th Cong., 2d sess. House. Ex. doc. 

 no. 88) Serial no. 1809 

 I. Geological exploration of the 40th parallel. 



11. Geographical surveys west of the 100th meridian. 



Official Publications Relating to the Geological 



Survey 



34 Documents relating to the organization of the U. S. 



Geological survey, 1874- 1880. 1 v. 



[Brought together and bound in the library of the Geological 

 survey, with typewritten title-page and table of contents] 



