by George A. Pavelis, Gilbert Duran, Harold Fred Kaiser, LeRoy Oscar Anderson, Russell M. Burns, Ruth Evelyn Gordon, Thomas C. Marcin, United States. Dept. of Agriculture, United States. Forest Service, C. Hor-Nay Pang, Edwin A. Hebb, Thomas Bruce Heebink, Alfred E. Oviatt, William C. Haynes

1972