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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 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 Bulletin of The British Ornithologists' Club, in 2007, in volume 127, pages 110-117
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Published in The Auk, in 1905, in volume 22, pages 429-434
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Published in Journal of Raptor Research, in 1997, in volume 31, issue 4, pages 358-363
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Published in The Wilson Bulletin, in 1951, in volume 63, issue 3, pages 218
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Published in The Auk, in 1910, in volume 27, pages 357-358
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