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  1. By: Mason, P. G. - Shemanchuk, J. A. - Canada. Agriculture Canada.
    Edition: Rev.
    Publication info: Ottawa :Agriculture Canada,1990.
    Holding Institution: Agriculture and Agri-Food Canada (archive.org)
  2. By: Mason, P. G. - Shemanchuk, J. A. - Canada. Agriculture Canada.
    Edition: Rév.
    Publication info: Ottawa :Agriculture Canada,1990.
    Holding Institution: Agriculture and Agri-Food Canada (archive.org)