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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Levin, M. H.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 82
    Issue: 2
    Date: 1968
    Page Range: 151--152
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Levin, M. H. - Keleher, G. M.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 83
    Issue: 2
    Date: 1969
    Page Range: 113--122
    Publication Info: Ottawa Ottawa Field-Naturalists' Club