Usher, J. H. 1982. Management limitations and barriers. Pages 60-64 in D. M. Shrimpton (ed.), Proceedings of the joint Canada-United States workshop on mountain pine beetle related problems in western North America. Canada Department of the Environment, Canadian Forestry Service, Pacific Forest Research Centre, Victoria, British Columbia, Information Report BC-X-230. 87 p.
Usher 1982
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