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Published in The Wilson Bulletin, in 1947, in volume 59, issue 3, pages 172
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Published in Asa Gray correspondence. Senders Ca-Cl, in 1891, pages 1-2
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Published in Asa Gray correspondence. Senders Ca-Cl, in 1891, pages 1-2
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Published in Asa Gray correspondence. Senders Ca-Cl, in 1891, pages 1-2
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Published in Asa Gray correspondence. Senders Ca-Cl, in 1890, pages 1-2
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Published in Asa Gray correspondence. Senders Ca-Cl, in 1890, pages 1-2
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Published in Asa Gray correspondence. Senders Ca-Cl, in 1890, pages 1-2
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Published in Asa Gray correspondence. Senders Ca-Cl, in 1890, pages 1-2
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Published in Bulletin of The African Bird Club, in 2000, in volume 7, issue 1, pages 13-17
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Published in Bulletin of The British Ornithologists' Club, in 2005, in volume 125, pages 149-153
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Published in Great Basin Naturalist, in 1977, in volume 37, pages 258
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Published in Forktail, in 1993, in volume 8, pages 7-9
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Published in Bulletin of The African Bird Club, in 2001, in volume 8, issue 1, pages 59
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Published in Annals of Tropical Medicine & Parasitology, in 1922, in volume 16, issue 4, pages 353-354
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Published in The Wilson Bulletin, in 1992, in volume 104, issue 4, pages 571-579
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Published in Journal of Raptor Research, in 1993, in volume 27, issue 1, pages 95
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Published in Bulletin of The African Bird Club, in 2003, in volume 10, issue 2, pages 107-108
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Published in The Great Basin Naturalist, in 1970, in volume 30, pages 55-70
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Published in Proceedings of The Biological Society of Washington, in 1939, in volume 52, pages 177-183
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Published in The Auk, in 1907, in volume 24, pages 453
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Published in Madroño, in 2006, in volume 53, pages 85-86
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Published in Bulletin of The British Ornithologists' Club, in 2007, in volume 127, pages 110-117
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Published in Bulletin of The British Ornithologists' Club, in 1999, in volume 119, pages 56-59
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Published in Zoosystema, in 1998, in volume 20, issue 2, pages 193-200
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Published in Journal of Raptor Research, in 1997, in volume 31, issue 4, pages 317-320
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Published in Proceedings of The Biological Society of Washington, in 1938, in volume 51, pages 177-181
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Published in The Auk, in 1905, in volume 22, pages 429-434
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