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2 resources
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Estey, Ralph H. “100 Years with the Quebec Society for the Protection of Plants/Les 100 Ans de La Société de Protection Des Plantes Du Québec.” Phytoprotection Vol. 89, no. 2–3 (December 2008): 51–65.
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Estey, Ralph H. “A History of the Quebec Society for the Protection of Plants.” History of Agriculture Vol. 2, no. 3 (1984): 67–92.