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  1. By: Hadwen, Seymour, - Bruce, E. A. (Edward Archibald), - Canada. Health of Animals Branch.
    Publication info: Ottawa, J. de L. Taché, 1917
    Holding Institution: Agriculture and Agri-Food Canada (AAFC)
  2. By: Hadwen, Seymour, - Palmer, L. J.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1922
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Hadwen, Seymour,
    Type: Article
    In: The Journal of parasitology
    Volume: 4
    Issue: 3
    Date: 1918-03
    Page Range: 135--137
    Publication Info: Chicago [etc.],
  2. By: Hadwen, Seymour,
    Type: Article
    In: The Ottawa naturalist
    Volume: 32
    Issue: 9
    Date: 1919-03
    Page Range: 173--174
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,