THE FOREST ATLAS. 67 



or -*- 2. Thus the scale may be 2 inches, 4 inches, or 8 

 inches to 1 mile; or i inch, J inch, or J inch to 1 mile. 

 Under no circumstances will sheets be prepared for the 

 Forest Atlas on the ratio of 3, 5, 7, etc. The scale of 

 township plats is 2 inches to 1 mile, because that scale 

 was adopted by the General Land Office, from which 

 the plats were procured. 



The Atlas sheets which cover a National Forest are 

 called Si folio and are assembled, with a legend page, in a 

 paper cover, on which is printed an index diagram show- 

 ing the number of the sheets. 



In the office of each district forester is a District 

 Atlas consisting of 20 or more volumes, containing 

 duplicate sheets of the Forest Atlas covering the area 

 of the district. Whenever Forest Atlas folios have 

 been duplicated by photolithography or otherwise for a 

 National Forest, the officers have been supplied with cop- 

 ies, but under no circumstances are copies of any atlas 

 folio to be sold or given away. They are strictly for the 

 use of forest officers in the administration of the National 

 Forests. Copies for distribution are not published. 



Forest Supervisors are supplied by the property clerk 

 with binders for Forest Atlas folios, having the binding 

 margin on the 21 -inch side, and also with binders for 

 Land Office township plats, having the binding margin 

 on the 18-inch side. 



The folios are the "mother maps" which furnish the 

 bases from which further map making will proceed in 

 the Forest Service. They correspond to the mother 

 maps of other countries in this respect that they are 

 compiled from official data upon a standard scale, 1 



