USDA Forest Service 

 Research Paper INT-233 

 August 1979 



VARIATION IN COLD HARDINESS AMONG POPULATIONS 



OF PSEUDOTSUGA MENZIESII VAR. GLA UCA 



Gerald E. Rehfeldt 



INTERMOUNTAIN FOREST AND RANGE EXPERIMENT STATION 

 Forest Service 

 U.S. Department of Agriculture 

 Ogden, UT 84401 



