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Year
1994
Citation

Clum, N.J., and T.J. Cade. 1994. Gyrfalcon (FALCO RUSTICOLUS). In A. Poole and F. Gill, editors, The Birds of North America, No. 114. Academy of Natural Sciences, Philadelphia, and American Ornithologists' Union, Washington, DC. 28 pp.

Keywords
Reference Code
N94CLU01NAUS