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