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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Outlines of a Natural Arrangement of the Falconidae (1875)
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 catalog of the higher groups, genera, species, and subspecies of birds known to occur in North ... sea, and the Galapagos Archipelago (Par
Ridgway, Robert; Friedmann, Herbert
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Die Nordamerikanische Vogelwelt (German Edition)
Ridgway, Robert; Nehrling, Henry
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