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  1. By: Norske videnskaps-akademi i Oslo. - Schei, Per Elisaeus, - Wille, Nordal
    Publication info: Kristiania,In commission by T. O. Brøgger,1907-1919.
    Holding Institution: Cornell University Library
  1. By: Wille, Nordal
    Type: Article
    In: Naturen : illustreret maanedsskrift for populaer naturvidenskab.
    Volume: 45
    Date: 1921
    Page Range: 97-106
    Publication info: Bergen :E. B. Giertsen [etc.]