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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Cicerello, R R - Butler, Robert S.
    Type: Article
    In: Brimleyana
    Volume: 11
    Date: 1985
    Page Range: 133--159
    Publication Info: [Raleigh, NC, North Carolina State Museum of Natural History], 1979-
  2. By: Schuster, Guenter A. - Butler, Robert S. - Stansbery, David H. (David Honor)
    Type: Article
    In: Transactions of the Kentucky Academy of Science
    Volume: 50
    Issue: 1-2
    Date: 1989-03
    Page Range: 79--85
    Publication Info: [Lexington, Ky.], Kentucky Academy of Science, 1923-1997