Area Burned - Acres 
710 
Journol of Agricultural Research 
Vol. XXX, No. 8 
• Yellow pine (60fires) 
© Douglas fir (86fires; 
* Spruce (69 fires) 
I Alpine (53fires) 
X Lodge pole (284 fires) 
H Grass (75fires) 
(* Brush-Aspen-Sage- 
Pinon and Juniper- 
(32 fires) 
Fig. 11. —Central Rocky Mountains and Wasatch Mountains 
(Regions 12, 13, and 14): Relation of size of fire to time elapsed 
between discovery and attack 
Note.— For Douglas fir, lodgepole pine, and alpine, curves 
are based on data for the Northern Rocky Mountains in addition 
to Central Rocky Mountains. 
