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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Gardiner, Edward G. (Edward Gardiner),
    Publication info: Leipzig, 1884
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: Bill (Anatomy)  Birds  Embryology  Epidermis  Keratinization  physiology  
  2. 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)