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  1. By: Ladd, Douglas - Wilhelm, Gerould S. - Harris, Richard C.
    Type: Article
    In: Evansia
    Volume: 11
    Issue: 4
    Date: 1994
    Page Range: 131--138
    Publication Info: Springfield, Mo American Bryological and Lichenological Society c1984-
  2. By: Ladd, Douglas - Wilhelm, Gerould S.
    Type: Article
    In: Lichenographia Thomsoniana : North American lichenology in honor of John W. Thomson
    Date: 1998
    Page Range: 89--104
    Publication Info: Ithaca, NY, Mycotaxon, Ltd, 1998
  3. By: Wilhelm, Gerould S. - Mohlenbrock, Robert H
    Type: Article
    In: SIDA, contributions to botany
    Volume: 11
    Date: 1986
    Page Range: 340--346
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-