Area Burned - Acres 
Apr. 15. 1925 
Use of Liability Ratings in Forest Fire Protection 709 
0 I 2 3 4 5 6 7 8 3 10 II 12 14 16 18 20 22 ' 24 26 28 30 32 34 36 3 6 40 
LEGEND Hours Elapsed 
. Yellow pine (497fires) Fj(K i 0 .— Black Hills and Easternontana (Region 11): Rela- 
Grass an ru h ^47fire 3 ; ^ion of size of fire to time elapsed between discovery and attack 
