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  1. Beiträge zur Kenntniss des Epitrichiums und der Bildung des Vogelschnabels / von Edward G. Gardiner.
    By: Gardiner, Edward G,
    Publication info: Leipzig,1884.
    Contributed by: Smithsonian Institution Libraries
    Subjects: Bill (Anatomy)  Birds  Embryology  Epidermis  Keratinization  Physiology
    BHL Collections: Smithsonian Institution Libraries
    View record   View book
  2. Secondary sexual characters and ecological competition.
    By: Rand, Austin Loomer,
    Publication info: [Chicago]Chicago Natural History Museum,1952.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Bill (Anatomy)  Sex (Biology)
    View record   View book
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