USDA Forest Service 

 Research Paper INT- 151 

 April 1974 



A COMPARISON OF RADIOGRAPHIC AND 

 BARK-REMOVAL METHODS FOR 

 SAMPLING OF MOUNTAIN PINE BEETLE POPULATIONS 



Gene D. Amman and Lynn A. Rasmussen 



INTERMOUNTAIN FOREST AND RANGE EXPERIMENT STATION 



Forest Service 

 U.S. Department of Agriculture 

 Ogden, Utah 84401 

 Roger R. Bay, Director 



