B Y 



C. W. PHILPOT 



U.S. DEPT. OF AGRICULTURE 

 NATIONAL AGRICULTURAL LfBRARY 



FEB 3 1970 



CURRENT SERIAL RECORDS 



USDA FOREST SERVICE 

 RESEARCH PAPER INT-61, 1969 



INTERMOUNTAIN FOREST& RANGE EXPER I MENT STATION, 



Ogden, Utah 



i' I, 



