Dunning, John S., 1905-, South American land birds: a photographic aid to identification/ John S. Dunning ; with the collaboration of Robert S. Ridgely ; sponsored by The World Wildlife Fund - Newtown Square, Pa.: Harrowood Books, 1982 - 364 p. :b ill. ; 24 cm. Includes index p. 335 ISBN: 0915180219 Subjects--Topical Terms: Birds--South America--Identification