THE AUTHOR 



Dale O. Hall is presently the Silviculturist and Project Leader 

 for Silviculture of Ponderosa Pine and Interior Douglas-fir, Inter- 

 mountain Station, Boise, Idaho. He obtained B.S. and M.F. degrees 

 from the University of California at Berkeley. Prior to the Boise 

 assignment, from 1960 to 1966, he was an Associate Silviculturist, 

 Pacific Southwest Station, at Challenge, California. From 1956 to 

 1960, he was Resident Forest Manager of Blodgett Forest, University 

 of California. He has been employed in the timber industry as a Log- 

 ging Engineer and as a Forestry Consultant. 



ACKNOWLEDGMENT 



Many people have contributed to this study during the 8 years of its duration. 

 James D. Curtis prepared the study plans, installed the studies, and made the 

 first analyses. Marvin W. Foiles worked closely with Curtis until Curtis retired 

 in 1966. Foiles transferred in mid-1967. Dale Potter and Gary G. Baertsch, 

 Forestrj'^ Technicians, successively assisted with the field installations and 

 measurements. Krassel District Ranger Howbert W. Bonnett and his successor 

 Edwin A. Heikkenen coordinated the logging operations at Zena Creek with plot 

 treatment needs. Project Sales Officer Larry Finn helped locate suitable plot 

 areas and supervised the planting crews. 



