Robert Ridgway
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A nomenclature of colors for naturalists and compendium of useful knowledge for ornithologists 1886
Robert Ridgway
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Nomenclature of North American Birds Chiefly Contained in the United States National Museum
Ridgway, Robert
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Color Standards and Color Nomenclature
Ridgway, Robert
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Outlines of a Natural Arrangement of the Falconidae (Classic Reprint)
Ridgway, Robert
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The Ornithology of Illinois
Ridgway, Robert
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Manual of North American Birds (Classic Reprint)
Ridgway, Robert
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