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by Ribe, John H.
Orono, Maine : Life Sciences and Agriculture Experiment Station, University of Maine at Ororno, 1973.

Series: Miscellaneous report (Life Sciences and Agriculture Experiment Station) ; 152.

St. Paul, Minnesota : North Central Forest Experiment Station, Forest Service, United States Department of Agriculture, 1981.

Series: Research paper (USDA Forest Service) ; NC-194.

by Alemdag, I. S.
Chalk River, Ont. : Petawawa National Forestry Institute, 1984.

Series: Information report (Petawawa National Forestry Institute) ; PI-X-46.

Fredericton, N. B. : Maritimes Forest Research Centre, Department of the Enviroment, 1980.

Series: Information report (Maritimes Forest Research Centre) ; M-X-108.