Fiftieth supplement to the American Ornithologists' Union Check-list of North American Birds
Chesser, Robert Terry, 1960-
Banks, Richard C. (Richard Charles), 1931-
Barker, F. Keith (Frederick Keith)
Remsen, J. V.
Stotz, Douglas F. (Douglas Forrester), 1956-
Washington, D.C. American Ornithologists' Union
In copyright. Digitized with the permission of the rights holder.