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13 Canadian Forestry Service 6 Canada. Environment Canada 5 Maine. Department of Conservation. Maine Forest Service 5 Smith, T. D. 4 Canada/United States Spruce Budworms Program 4 Forest Pest Management Institute (Canada) more ... 4 Maine. Bureau of Forestry 4 Nova Scotia. Department of Lands and Forests 3 Carter, Nelson E. 3 Dyer, Richard 3 Laurentian Forestry Centre 3 Maritimes Forest Research Centre 3 Northeastern Forest Experiment Station (Radnor, Pa.) 3 Nova Scotia. Dept. of Lands and Forests 2 British Columbia. Ministry of Forests 2 Canadian Forest Service 2 Canadian Forestry Service annual forest pest control forum Hull, P.Q.) 2 Canadian Forestry Service annual forest pest control forum Ottawa, Ontario) 2 Chemical Control Research Institute (Canada) 2 Georgeson, E. 2 IEA Coal Research 2 Kettela, E. G. 2 Maine Forest Service 2 New Brunswick Committee for Environmental Monitoring of Forest Insect Control Operations (EMOFICO) 2 New Brunswick Department of Natural Resources and Energy 2 New Brunswick. Department of Environment 2 Newfoundland Forest Research Centre 2 Nova Scotia Department of Lands and Forests. Entomological Services 2 Richardson, J. 2 Selser, Jan see all ... less ...
Year of Publication