Canadian Forestry Service publication
Department of the Environment, Canadian Forestry Service
Wolf G. Ziller
Canadian Forestry Service 1974 Canadian Forestry Service publication no. 1329
Available at 2 libraries
A.H. Rose and O.H. Lindquist
Department of the Environment, Canadian Forestry Service 1973 Canadian Forestry Service publication 1313
Available at 1 libraries
by P.A. Murtha
Information Canada c1972 Canadian Forestry Service publication no. 1292