USaA»Forest Service 

 Bfesearch^per 1^-119^ 



' Marfeii 1972 



BARK BEETLE RISK IN 

 MATURE PONDEROSA PINE FORESTS IN 

 WESTERN MONTANA 



Philip C. lohnson 



INTERMOUNTAIN FOREST AND ^ANGE EXPERIMENT STATION . -f-ySO/^ 

 ^ ' Forest Service ' 



U.S. D|epartment of Agriculture 

 ■•"^bgden, Utah .84401 

 Robert W. Harris, Director 



