This publication represents the combined efforts of several men in Intermoimtain 

 Forest and Range Experiment Station and the Intermountain Region of the Forest Service. 



Basic field data were collected by: Bruce G. Brown, John C. Combs, Robert I. Cot- 

 tingham, Joseph A. Draper, Herman W. Gabriel, Jimmie R. Kimbal, Henry S. Lee, David 

 P. Paine, Varold P. Rolfson, and J. Birchell Stewart. 



Analysis of the data and preparation of the report were done chiefly by: S. Blair 

 Hutchison, John H. Wikstrom, Roscoe Burwell Herrington, and Robert E. Benson. 



