Vreparative techniques and tissue-selection 

 criteria for in vitro culture of healthy 



AND RUST-INFECTED CONIFER TISSUE^,-?^.^ 



, J. L Grasham and A. E. Harvey 



fcr/oN 



CORDS 



USDA Forest Service Research Paper INT-82, 1970 



INTERAAOUNTAIN FOREST AND RANGE 

 EXPERIMENT STATION 

 Ogden, Utah 84401 



