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  1. By: Hubbard, William A. - Waldern, D. E., - Canada. Agriculture Canada. Information Services.
    Edition: Rev.
    Publication info: Ottawa, Information Division, Canada Dept. of Agriculture, 1976
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)
  2. By: Hubbard, William A. - Canada. Agriculture Canada. Information Services.
    Edition: Rev.
    Publication info: 1975
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)