A fine set of Volumes I and II in dust jackets. First printings. Volume I: The Oscine Passerines, 1989, 516 pp. and Volume II: The Suboscine Passerines, 1994, 814 pp. Color plates by Guy Tudor. Remains the definitive work on South America birds. Two additional volumes were planned, but publication remains in doubt. In print at $95 per volume.