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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hobbs, G. A. - Canada. Department of Agriculture.
    Edition: Rev.
    Publication info: Ottawa, : Canada Department of Agriculture, 1967
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)
    Subjects: Alfalfa leafcutting bee  Apidae  beekeeping