80 
THE UNITED STATES GEOLOGICAL SURVEY. [bull. 22: 
impracticable to visit on account of expense 
The 
points which it i: 
information thus obtained has been found to be of great value and 
assistance in carrying out the work of the division. The data are 
recorded on printed cards of three types, designed for information 
Fig. 
-Map showing progress of work on underground waters in western half of United 
States in 1903-4. 
relating to city or town water supplies, deep wells, and springs. The 
cards are so arranged that they can be submitted directly to the printer 
as copy for tabular reports. Plans have been made whereby bibliog- 
raphies covering hydrography and hydrology, similar to those which 
have proved of so much value to geologists, will be prepared annually. 
