THE AUTHORS 



RULON B. GARDNER is a civil engineer and principal research engineer 

 in forest engineering research, located at the Intermountain Station's 

 Forestry Sciences Laboratory, Bozeman, Montana. He has been con- 

 ducting harvesting and transportation systems research in the Rocky 

 Mountain West for the past 15 years — most recently in methods and 

 systems designed to increase timber utilization while reducing envi- 

 ronmental impacts. 



ERWIN L. SCHAFFER is a supervisory research engineer for the USDA 

 Forest Service, Forest Products Laboratory, Madison, Wisconsin. 

 He directed structural flakeboard, Press-Lam, and processing re- 

 search plywood during the period 1970 to 1975. Currently he is in 

 charge of the Fire Design Technology research work unit there. He 

 has a Ph.D. in Engineering Mechanics, and M.S. and B. S. degrees 

 in Civil-Structural Engineering from the University of Wisconsin. 



JOHN R. ERICKSON was a project leader at the USDA Forest Service, 

 North Central Forest Experiment Station, Forest Engineering Lab- 

 oratory, Houghton, Michigan, from 1965 to 1975. In 1975 he trans- 

 ferred to the Forest Products and Engineering Staff, Washington, 

 D.C. He holds bachelor's and master's degrees in Mechanical Eng- 

 ineering from Michigan Technological University, Houghton, Michigan. 



