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  1. By: Roberts, S P M - Cooper, Laura S. - Stewart, Leslie J. - Newberry, Clayton C. - St. Clair, Larry L.
    Type: Article
    In: Lichenographia Thomsoniana : North American lichenology in honor of John W. Thomson
    Date: 1998
    Page Range: 309--314
    Publication Info: Ithaca, NY, Mycotaxon, Ltd, 1998
  2. By: Else, George R. - Roberts, S P M
    Type: Article
    In: British journal of entomology and natural history
    Volume: 7
    Date: 1994
    Page Range: 59--65
    Publication Info: [London], British Entomological and Natural History Society, 1988-