Survey Method 



The inventory statistics presented in this paper were assembled 

 under the compilation method of survey. This method involves 

 first the preparation of detailed type maps and second the compila 

 tion of area by various forest stratifications and the computation 

 of volijme statistics from area statistics and average acre volumes 



Preliminary cover classifications were made on a base map l/ by 

 township units from aerial photographs, Forest Service grazing 

 maps and General Land Office plats. These classifications were 

 checked and further stratified by field inspection. 



Detailed timber cruises for this country were not available from 

 either public or private agencies. Therefore, timber volumes 

 were determined from sample plots and ocular estimates for each 

 sawtimber stand and from modified normal yield tables for other 

 stands. The modified normal yield tables were derived from a 

 correlation of actual volumes as determined by sample plots with 

 normal volumes by type, stocking, age, and site class. 



1/ Upon request copies of the individual tov/nship maps are avail- 

 able at the cost of printing. 



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