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John Ashton
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Curious Creatures in Zoology
(New York: Cassel Publishing, 1890) 
Web site/resource link
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John Cherry, ed.
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Mythical Beasts
(London: British Museum Press/Pomegranite Artbooks, 1995)
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Anne Clark
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Beasts and Bawdy
(New York: Taplinger Publishing Company, 1975)
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Rodney Dennys
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The Heraldic Imagination
(London: Barrie & Jenkins, 1975)
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George C. Druce
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Notes on the History of the Heraldic Jall or Yale
(Archaeological Journal, 68, 1911, 173-199)
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Wilma B. George
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The Yale
(Journal of the Warburg and Courtauld Institutes, 31, 1968, 423-28) 
Web site/resource link
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Florence McCulloch, Pierre Gallais, Yves-Jean Riou, eds.
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L' éale et la centicore: deux bêtes fabuleuses
(in Pierre Gallais, Yves-Jean Riou, eds., Mélanges offerts à René Crozet à l'occasion de son soixante-dixième anniversaire par ses amis, v. 2, Poitiers: Société d'études médiévales, 1966, 1167-1172)
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