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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Gibson, Arthur, - Twinn, C. R. (Cecil Raymond)
    Edition: Rev.
    Publication info: Ottawa, Minister of Agriculture, 1931
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)
  2. By: Gibson, Arthur, - Twinn, C. R. (Cecil Raymond)
    Publication info: [Sainte-Marthe-sur-Le-Lac, Abbaye Sainte-Marie-des-deux-Montagnes, [s.d.]
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)
  3. By: Twinn, C. R. (Cecil Raymond) - Canada. Department of Agriculture.
    Publication info: Ottawa, Canada Department of Agriculture, 1956
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)
  4. By: Twinn, C. R. (Cecil Raymond) - Canada. Department of Agriculture. Science Service.
    Publication info: Ottawa, Canada Department of Agriculture, 1956
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)
  5. By: Twinn, C. R. (Cecil Raymond) - Canada. Division of Entomology.
    Publication info: Ottawa, Ministère de l'agriculture du Canada, Service des sciences, Division de l'entomologie, 1957
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)
  6. By: Twinn, C. R. (Cecil Raymond) - Peterson, D. G. - Canada. Department of Agriculture.
    Publication info: Ottawa, Science Service, Entomology Division, Canada Dept. of Agriculture, 1955 (1958 printing)
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)