Robert Ridgway
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A Nomenclature of Colors for Naturalists: And Compendium of Useful Knowledge for Ornithologists
Ridgway, Robert
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Color Standards and Color Nomenclature: With Fifty-Three Colored Plates and Elev: Full Color Photographic Edition
Ridgway, Robert
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Color Standards and Color Nomenclature
Ridgway, Robert
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The Birds of North and Middle America: A Descriptive Catalogue of the Higher Groups, Genera, Species, and Subspecies of Birds Known to Occur in North ... West Indies and Other Islands of the Caribbe
Ridgway, Robert; Friedmann, Herbert
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Nomenclature Of North American Birds: Chiefly Contained In The United States National Museum (1881)
Ridgway, Robert
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Die Nordamerikanische Vogelwelt
Ridgway, Robert; Nehrling, Henry
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The Birds of North and Middle America, Vol. 9: A Descriptive Catalog of the Higher Groups, Genera, Species, and Subspecies of Birds Known to Occur in ... the West Indies and Other Islands of the C
Robert Ridgway
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