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  1. By: Gockman, Otto T. - Thayer, John W. - Henderson, Bobby
    Type: Article
    In: Opuscula philolichenum
    Volume: 19
    Date: 2020
    Page Range: 14--35
    Publication Info: Philadelphia J. Lendemer 2004-
  2. By: Gockman, Otto T. - Selva, Steven B. - McMullin, Richard Troy
    Type: Article
    In: Opuscula philolichenum
    Volume: 18
    Date: 2019
    Page Range: 52--57
    Publication Info: Philadelphia J. Lendemer 2004-