Sharon C. Johnson, Peggy E. Gwinn, Alice H. Ulrich, 
Linda D. Rodgers, Steven R. Boutcher, Seabelle J. Ball, 
Laurie Garnett, and Renee Y. Blue provided assistance on 
major parts of the study. 
Many others have provided support and assistance for this 
study. The authors specifically want to express their 
appreciation for this help to John E. Alcock, J. Lamar 
Beasley, Robert E. Buckman, Thomas H. Ellis, ‘Thomas E. 
Hamilton, H. Fred Kaiser, Jr., William J. Lange (National 
Forest Products Association), and Donald F. Smith (Boise 
Cascade Corporation). 
Vill 
