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2 resources
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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.
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Estey, Ralph H. “Margaret Newton: Distinguished Canadian Scientist.” In Despite the Odds: Essays on Canadian Women and Science, edited by Marianne Gosztonyi Ainley, 236–247. Montreal: Véhicule Press, 1990.