APPENDIX 3 

 PUBLICATIONS 



Topographic Maps and Folios and Geologic Folios 



The topographic maps and folios and the geologic folios issued by 

 the United States Geological Survey may be obtained from the Direc- 

 tor of the United States Geological Survey, Washington, D. C. 



A large pamphlet, issued by the Survey, entitled "Topographic 

 Maps and Folios and Geologic Folios" contains a list of all the topo- 

 graphic maps and folios and the geologic folios. A list of the geo- 

 logic folios is also contained in a Survey publication entitled "Pub- 

 lications of the United States Geological Survey." The Survey pub- 

 lishes a set of "index circulars" which show the maps and folios com- 

 pleted for different regions of the country and the stages of the work 

 in areas for which maps and folios are in preparation. In addition 

 the Survey has prepared a circular which gives a list of the maps 

 which illustrate various physiographic types and a general circular 

 in regard to the geologic folios. 



Topographic Maps and Folios 



The topographic maps and folios published by the Survey fall into 

 three classes: 

 i. Topographic Atlas Sheets 



2. Topographic Folios 



3. Special Topographic Maps 



Topographic Atlas Sheets. Under this title are published by far 

 the greatest number of topographic maps. The price of each stand- 

 ard atlas sheet is 10 cents. 



Topographic Folios. Three topographic folios, consisting of sepa- 

 rate topographic atlas sheets, assembled to illustrate types of topog- 

 raphy, have been published. No others are projected. The price 

 of two of these folios is 25 cents each. The price of the other 

 folio is 50 cents. 



Special Topographic Maps. These usually consist of several topo- 

 graphic atlas sheets or parts of sheets combined on a single sheet, 

 sometimes on a larger or smaller scale than the regular sheets. 



Geologic Folios 



The geologic folios published by the Survey fall into three 

 classes 



1. Geologic Atlas Folios 



2. Geologic Atlas Sheets 



3. Special Geologic Maps 



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