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  1. By: Mulligan, Gerald A.,
    Publication info: [Ottawa] :Agriculture Canada,1990.
    Holding Institution: Agriculture and Agri-Food Canada (archive.org)
  2. By: Mulligan, Gerald A.,
    Publication info: [Ottawa] :Agriculture Canada,1990.
    Holding Institution: Agriculture and Agri-Food Canada (archive.org)
  3. By: Mulligan, Gerald A., - Munro, Derek B. - Canada. Agriculture Canada. Research Branch.
    Publication info: Ottawa :Research Branch, Agriculture Canada,1983.
    Holding Institution: Agriculture and Agri-Food Canada (archive.org)
  4. By: Mulligan, Gerald A., - Munro, Derek B. - Biosystematics Research Institute (Canada) - Canada. Agriculture Canada. Research Branch.
    Publication info: Ottawa :Research Branch, Agriculture Canada,1984.
    Holding Institution: Agriculture and Agri-Food Canada (archive.org)