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Perspectives in Ornithology: Charles Darwin's Fancy. Robert Montgomerie [PDF] Supplement: Fiftieth Supplement to the American Ornithologists' Union Check-list of North American Birds. R. Terry Chesser, Richard C. Banks, F. Keith Barker, Carla Cicero, Jon L. Dunn, Andrew W. Kratter, Irby J. Lovette, Pamela C. Rasmussen, J. V. Remsen, Jr., James D. Rising, Douglas F.
