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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 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.
    Contributed by: University Library, University of Illinois Urbana Champaign
    Subjects: Bill (Anatomy)  Sex (Biology)  
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  3. Size-variation in Pyrenestes, a genus of weaver-finches. Bulletin of the AMNH ; v. 49, article 4
    By: American Museum Congo Expedition (1909-1915) - Chapin, James P. - Lang, Herbert,
    Publication info: New York : Published by order of the Trustees, American Museum of Natural History 1924
    Contributed by: American Museum of Natural History Library
    Subjects: Africa  Bill (Anatomy)  Birds  Congo (Democratic Republic)  Pyrenestes  Size  Variation  
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