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By: Gardiner, Edward G. (Edward Gardiner),Edition:Publication info: Leipzig, 1884Volume:Series:Holding Institution: Smithsonian Libraries and ArchivesSubjects: Bill (Anatomy) Birds Embryology Epidermis Keratinization physiologyBHL Collections:
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By: Rand, Austin Loomer,Edition:Publication info: [Chicago], Chicago Natural History Museum, 1952Volume: v.34:no.6 (1952)Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects: Bill (Anatomy) Sex (Biology)BHL Collections: