The Birds of Ecuador: v. 2 (Helm Field Guides)
by Robert S. Ridgely,Paul J. Greenfield,Paul J. Greenfield
ISBN 13: 9780713661170
Format: Paperback (748 pages) Publisher: Helm Published: 31 Jul 2001
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Birds of Western Ecuador: A Photographic Guide
by Nick Athanas,Paul J. Greenfield,Iain Campbell,Pablo Cervantes Daza,Andrew Spencer
ISBN 13: 9780691157801
Format: Paperback (448 pages) Publisher: Princeton University Press Published: 28 Jun 2016
The Birds of Ecuador: Status, Distribution, and Taxonomy / Field Guide Vols I & II: Two-Volume Set
by Robert S. Ridgely,Paul J. Greenfield,Frank B. Gill
ISBN 13: 9780801487224
Format: Paperback (1648 pages) Publisher: Cornell University Press Published: 30 May 2001