THE REGION AND ITS TIMBERLANDS 
The region covered by this bulletin, as the name indicates, is 
roughly the commercial range of lodgepole pine in the Rocky Moun- 
tain and intermountain regions. (Fig. 1.) It includes that por- 
tion of Montana east of the Continental Divide and extending to the 
Figure 1. 
-Commercial range of lodgepole pine in the Rocky Mountain and inter- 
mountain regions 
western yejlow pine type in the eastern portion of the State; all of 
Wyoming, except the Black Hills region along the eastern boundary 
of the State ; the fringe of forests in eastern Idaho south and east of 
the junction of the Bitterroot Range with the Continental Divide; 
Colorado and Utah down to the western yellow pine type in the 
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