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  1. By: Hays, Helen
    Type: Article
    In: The Canadian field-naturalist
    Volume: 85
    Issue: 1
    Date: 1971
    Page Range: 81--82
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Hays, Helen - LeCroy, Mary
    Type: Article
    In: The Wilson bulletin
    Volume: 83
    Issue: 4
    Date: 1971
    Page Range: 425--429
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Hays, Helen
    Type: Article
    In: Transactions of the Linnaean Society of New York
    Volume: 10
    Date: 2007-09
    Page Range: 265--279
    Publication Info: New York, The Society, 1882-
  4. By: Connors, Peter G. - Anderlini, Victor G. - Risebrough, Robert W. - Gilbertson, Michael - Hays, Helen
    Type: Article
    In: The Canadian field-naturalist
    Volume: 89
    Issue: 2
    Date: 1975
    Page Range: 157--162
    Publication Info: Ottawa Ottawa Field-Naturalists' Club