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