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By: Dustan, G. Gordon. - Willison, R. S.Edition:Publication info: [Ottawa] Canada Dept. of Agriculture [R. Duhamel, Queen's printer] 1968Volume: 4Series:Holding Institution: Agriculture and Agri-Food Canada (AAFC)Subjects: Agriculture Botanical laboratories Canada Dept. of Agriculture Dominion laboratory of Plant Pathology, St. Cathar Fruit Insect Laboratory, Vineland, Ontario ResearchBHL Collections: