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
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 ... The West Indies And Other Islands Of The
Ridgway, Robert; Friedmann, Herbert
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Birds Of The Galapagos Archipelago
Ridgway, Robert
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Manual of North American Birds (Classic Reprint)
Robert Ridgway
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