e map are printed the names ot adjoining - qui fr 
which maps have >een published. Over 2,800 quadrangl 
the United States have been surveyed, and maps of ! 
similar to the one on the other side of this sheet have 
The topographic map is the base on which the geology 
mineral resources of a quadrangle are represented an 
maps showing these features are bound together with a des 
live text to form a folio of the Geologic Atlas of the U 
States. IrilP : -r.J— ■ 
Index ina] is of each State showing the topographic maps 
geologic folios published bv the United States Geological; 
vey may be obtained tree. Copies of the topographic i 
may be obtained for 10 cents each, or in lots of 50 or ± 
either of the same or of different quadrangles, for ( cents 
The geologic folios are sold for 25 cent- or more each, the 
depending on the size of the folio. A circular describing 
folios will be sent on request. 
Applications for maps or folios should be accompaniej 
cash, draft, or money order (not postage stamps) and shou- 
addressed to 
THE DIRECTOR, 
N o 
Urfi 
United States Geological Survey 
Walking Ion, 
