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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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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Color Standards and Color Nomenclature
Ridgway, Robert
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Nomenclature Of North American Birds: Chiefly Contained In The United States National Museum (1881)
Ridgway, Robert
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The Ornithology of Illinois, Vol. 1: Part I. Descriptive Catalogue; Part II. Economic Ornithology (Classic Reprint)
Robert Ridgway
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Birds of the Galapagos Archipelago
Ridgway, Robert
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