ROBERT D. PFISTER, Associate Silviculturist and leader 

 of the silviculture of western larch and Engelmann 

 spruce work unit at Missoula, Montana, joined the 

 Intermountain Station staff in 1961. He holds the B.S. 

 and M.S. degrees in forest management from Iowa 

 State University and Oregon State University, respec- 

 tively. During this study the author was stationed at 

 the Forestry Sciences Laboratory in Moscow, Idaho. 



