28 THE U. S. GEOLOGICAL SURVEY 



military service resulted in the plans for the Survey's entire 

 field work in topography being made to conform to a program 

 drawn up by the General Staff of the Army. The map print- 

 ing plant of the Survey was also made available to the War 

 and Navy Departments for which it has printed a great num- 

 ber of charts and maps. 



In addition to these military topographic surveys, the Sur- 

 vey made special examinations of underground waters and 

 soil drainage in a number of localities that were under con- 

 sideration by the War Department for military encampments. 



Of no less importance for the prosecution of the war are 

 the special investigations which have been made by the Sur- 

 vey with a view to locating new deposits of minerals, both 

 metals and non-metals, required in the manufacture of muni- 

 tions. Among these minerals are manganese, pyrite, platinum, 

 chromite, tungsten, antimony, potash, quicksilver, and nitrate. 



Perhaps the most striking contribution made by the Survey 

 to the military service has been the group of specially trained 

 engineers in its personnel who have been commissioned in the 

 Engineer Officers' Reserve Corps. At the end of the fiscal 

 year 191 7, this group included one geologist, seven hydro- 

 graphic engineers, and sixty-one topographic engineers. 



