Robert S. Ridgely

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The Birds of Ecuador Vol 2: v. 2 (Helm Field Guides)
Greenfield, Paul J.; Ridgely, Robert S.

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� 5.05

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A Guide to the Birds of Panama: With Costa Rica, Nicaragua, and Honduras
Ridgely, Robert S.; Jr., John A Gwynne

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� 3.82

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A Guide to the Birds of Panama
Robert S Ridgely

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� 9.07

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The Birds of South America: Volume 1: The Oscine Passerines
Ridgely, Robert S.

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� 9.29

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Wildlife Conservation Society Birds of Brazil: The Atlantic Forest of Southeast Brazil, including S�o Paulo and Rio de Janeiro: VOLUME 2 (WCS Birds of Brazil Field Guides)
Ridgely, Robert S.; Gwynne, John A.; Tudor, Guy; Argel, Martha

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� 14.29

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Field Guide to the Songbirds of South America: The Passerines
Ridgely, Robert S.; Tudor, Guy

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� 13.87

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The Birds of South America: Vol. II, The Suboscine Passerines
Ridgely, Robert S.; Tudor, Guy

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� 15.42

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The Birds of Ecuador: Status, Distribution, and Taxonomy: 1 (Comstock books)
Ridgely, Robert S.; Greenfield, Paul J.

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� 17.15

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