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Robert S. Ridgely and Paul J. Greenfield ; with the collaboration of Mark B. Robbins and Paul Coopmans ; in association with the Academy of Natural Sciences ; [foreword by Frank B. Gill]
Comstock 2001 The birds of Ecuador / Robert S. Ridgely and Paul J. Greenfield v. 2
pbk
Available at 3 libraries
Robert S. Ridgely and Paul J. Greenfield ; with the collaboration of Mark B. Robbins and Paul Coopmans ; in association with the Academy of Natural Sciences
Comstock 2001 The birds of Ecuador / Robert S. Ridgely and Paul J. Greenfield v. 1
Available at 2 libraries
University of Texas Press 1994 1st ed The birds of South America / by Robert S. Ridgely and Guy Tudor ; in association with the Academy of Natural Sciences of Philadelphia v. 2
by Robert S. Ridgely and John A. Gwynne, Jr
Princeton University Press c1989 2nd ed
alk. paper , pbk.
by Robert S. Ridgely and Guy Tudor ; with the collaboration of William L. Brown ; in association with World Wildlife Fund
Oxford University Press 1989
v. 1
Available at 1 libraries
by Robert S. Ridgely and Guy Tudor ; in association with the Academy of Natural Sciences of Philadelphia
University of Texas Press 1989- 1st ed.
v. 1 , v. 2
John S. Dunning with the collaboration of Robert S. Ridgely
Harrowood Books c1987
pbk.
by Robert S. Ridgely ; illustrated by John A. Gwynne, Jr.
Princeton University Press [c1976]