USDA Forest Service 

 Research Paper INT-82 

 1970 



PREPARATIVE TECHNIQUES AND 

 TISSUE-SELECTION CRITERIA FOR 

 IN VITRO CULTURE OF HEALTHY AND 

 RUST-INFECTED CONIFER TISSUES 



J. L Grasham and A. E. Harvey 



INTERMOUNTAIN FOREST AND RANGE EXPERIMENT STATION 



Forest Service 

 U. S. Department of Agriculture 

 Ogden, Utah 84401 

 Joseph F. Pechanec, Director 



