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  1. By: Bootsma, A. - Boisvert, Johanne, - Canada. Agriculture Canada. Direction générale de la recherche.
    Publication info: [Ottawa] :Research Branch, Agriculture Canada,1991.
    Holding Institution: Agriculture and Agri-Food Canada (archive.org)
  2. By: Bootsma, A. - Canada. Agriculture Canada. Research Branch. - Land Resource Research Centre (Canada)
    Publication info: Ottawa :Agriculture Canada, Research Branch,c1991.
    Holding Institution: Agriculture and Agri-Food Canada (archive.org)
  3. 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)
  4. By: Bootsma, A. - Canada. Agriculture Canada. Direction générale de la recherche. - Institut de recherche sur les terres (Canada)
    Publication info: Ottawa :Agriculture Canada, Direction générale de la recherche,1984.
    Holding Institution: Agriculture and Agri-Food Canada (archive.org)