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  1. By: Dumanski, J. (Julian) - Kirkwood, V. - Canada. Agriculture Canada. Research Branch.
    Publication info: [Ottawa] :Research Branch, Agriculture Canada,1988.
    Holding Institution: Agriculture and Agri-Food Canada (archive.org)
  2. By: Bootsma, A. - De Jong, Reinder. - Dumanski, J. (Julian) - Canada. Agriculture Canada. Research Branch. - Canada. Centre for Land and Biological Resources Research.
    Publication info: Ottawa :Research Branch, Agriculture Canada,1992.
    Holding Institution: Agriculture and Agri-Food Canada (archive.org)