'<V States 

 . / ifnent 

 ^^^d^ of Agriculture 



Forest Service 



Intermountain 

 Research Station 



Research Paper 

 INT-RP-481 



Age-Class Structure of Old 

 Growth Ponderosa Pine/g 

 Douglas-Fir Stands and^s 



3, 



2, 



Relationship to Fire Histi^l'y?, % 



Joe H. Scott 5^0^ ■' ^ 



Michael G. Hartwell % 



Stephen F. Arno 



