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  1. By: Bertrand, Paul,
    Publication info: Lille, Impr. L. Danel, 1909
    Holding Institution: Harvard University Botany Libraries
    Subjects: Filices, Fossil  Zygopteraceae  
  2. By: Gothan, Walther (Walther Ulrich Eduard Friedrich),
    Publication info: Berlin, Königlich Preussischen Geologischen Landesanstalt, 1913
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Carboniferous  Filices, Fossil  Paleontology  Silesia