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  1. By: Catling, Paul M. - Layberry, Ross A
    Type: Article
    In: The Canadian field-naturalist
    Volume: 127
    Issue: 3
    Date: 2013-12-03
    Page Range: 224--228
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Layberry, Ross A - Catling, Paul M.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 130
    Issue: 2
    Date: 2016-04-01
    Page Range: 137--139
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  3. By: Catling, Paul M. - Layberry, Ross A
    Type: Article
    In: Journal of the Lepidopterists' Society
    Volume: 52
    Date: 1998
    Page Range: 98--104
    Publication Info: [New Haven, Conn.] Lepidopterists' Society 1959-
  4. By: Catling, Paul M. - Layberry, Ross A - Crolla, Jeffrey P - Hall, Peter W.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 112
    Issue: 2
    Date: 1998
    Page Range: 335--337
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  5. By: Layberry, Ross A
    Type: Article
    In: The Canadian field-naturalist
    Volume: 89
    Issue: 3
    Date: 1975
    Page Range: 316--316
    Publication Info: Ottawa Ottawa Field-Naturalists' Club