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  1. By: Jefferson, Thomas A - Schulman-Janiger, Alisa
    Type: Article
    In: Bulletin
    Volume: 117
    Issue: 1
    Date: 2018
    Page Range: 29--51
    Publication Info: Los Angeles, Calif, The Academy, 1971-
  2. By: Jefferson, Thomas A
    Type: Article
    In: The Canadian field-naturalist
    Volume: 104
    Issue: 1
    Date: 1990
    Page Range: 112--116
    Publication Info: Ottawa Ottawa Field-Naturalists' Club