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Edward Lear and Knowsley. Liverpool: Walker Art Gallery, 1975.
The Birds of Edward Lear. A Selection of the Twelve Finest Plates of the Artist. Edited by Adrian Thorpe. London: The Ariel Press, 1975.
The Family of Parrots. New York: American Museum of Natural History; San Francisco: Pomegranate Artbooks, 1997
Bell, Thomas. A Monograph of the Testudinata. London, 1832-1836. [CD-ROM facsimile edition, Octavo, 1999]
The Naturalists Library. Edited by Sir William Jardine. Vols. IX & XVIII. London, 1843.
Gray, G.R. The Genera of Birds. Vol. II. London, 1849.
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