^1 



PUBLICATIONS OF 

 THE NORTHERN ROCKY MOUNTAIN 

 FOREST AND RANGE EXPERIMENT STATION 



3 1951 



Northern 

 Rocky Mountain 

 rorcat & Uan^e 

 EAperifflcnt station 



Missoula Montana 



Georqe M- Jemison, Director 



UNITED STATES DEPARTMENT OF AGRICULTURE 

 FOREST SERVICE 



Station Paper 31 



July 19 



