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Please read BHL's Acknowledgment of Harmful Content
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  1. 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 (AAFC)