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The Birds of Ecuador: Field Guide

by Robert S. Ridgely, Paul J. Greenfield
ISBN-13: 9780801487217
ISBN-10: 0801487218
Edition: First Edition
Publication date: 2001
Publisher: Comstock Publishing Associates
Format: Paperback 740 pages

Wildlife Conservation Society Birds of Brazil: The Atlantic Forest of Southeast Brazil, including São Paulo and Rio de Janeiro (WCS Birds of Brazil Field Guides) (VOLUME 2)

by Robert S. Ridgely, John A. Gwynne, Guy Tudor, Martha Argel
ISBN-13: 9781501704536
ISBN-10: 1501704532
Edition: Illustrated
Publication date: 2016
Publisher: Comstock Publishing Associates
Format: Paperback 432 pages

Wildlife Conservation Society Birds of Brazil: The Pantanal and Cerrado of Central Brazil

by John A. Gwynne, Robert S. Ridgely, Guy Tudor, Martha Argel
ISBN-13: 9780801476464
ISBN-10: 0801476461
Edition: Illustrated
Publication date: 2010
Publisher: Comstock Publishing Associates
Format: Paperback 336 pages

The Birds of Ecuador Field Guide

by Robert S. Ridgely
ISBN-13: 9780713661170
ISBN-10: 0713661178
Publication date: 2001
Publisher: Helm
Format: Paperback 748 pages

Field Guide to the Songbirds of South America: The Passerines

by Robert S. Ridgely, Guy Tudor
ISBN-13: 9780292717480
ISBN-10: 0292717482
Edition: First Edition
Publication date: 2009
Publisher: University of Texas Press
Format: Hardcover 760 pages

Wings from Afar: An Ecoregional Approach to Conservation of Neotropical Birds in South America

by Leslie Adkin, Robert S. Ridgely, Roberto Roca
ISBN-13: 9781886765030
ISBN-10: 1886765030
Edition: 1
Publication date: 1996
Publisher: The Nature Conservancy 1
Format: Paperback 180 pages

Una lista anotada de las aves del Ecuador Continental / An annotated list of the birds of Mainland Ecuador

by Robert S. Ridgely, Paul J. Greenfield, Mauricio Guerrero G.
ISBN-13: 9789978404874
ISBN-10: 9978404872
Edition: 1st Ed.
Publication date: 1998
Publisher: Fundacion Ornitologica del Ecuador, CECIA
Format: Paperback 132 pages

A Guide to the Birds of Panama: With Costa Rica, Nicaragua, and Honduras

by Robert S. Ridgely, John A. Gwynne
ISBN-13: 9780691025124
ISBN-10: 0691025126
Edition: 2
Publication date: 1992
Publisher: Princeton University Press
Format: Paperback 412 pages

The Birds of South America: Volume 1: The Oscine Passerines

by Robert S. Ridgely, Tudor Guy
ISBN-13: 9780292707566
ISBN-10: 0292707568
Edition: First Edition
Publication date: 1989
Publisher: University of Texas Press
Format: Hardcover 516 pages

A Guide to the Birds of Panama, with Costa Rica, Nicaragua, and Honduras

by Robert S. Ridgely, John A. Gwynne Jr.
ISBN-13: 9780691085296
ISBN-10: 0691085293
Edition: 2nd
Publication date: 1989
Publisher: Princeton University Press
Format: Hardcover 534 pages