Robert S. Ridgely
Books
The Birds of South America
1989
ISBN 9780292770638
The Birds of Ecuador
2001
ISBN 9780713661170
A guide to the birds of Panama
1976
ISBN 9780691085296
Guide to the Birds of Panama
1981
ISBN 9780691025124
Wings from Afar
1996
ISBN 9781886765030
Birds of Ecuador Field Guide
2001
ISBN 9780801487217
The Birds of Ecuador, Vol. 1
2001
ISBN 9780801487200