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Published in Bulletin of The British Ornithologists' Club, in 1963, in volume 83, pages 25-29
Created: 2012-12-03, modified: 2012-12-03
Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 30-31
Created: 2012-12-03, modified: 2012-12-03
Published in Bulletin of The British Ornithologists' Club, in 1967, in volume 87, pages 63
Created: 2012-12-03, modified: 2012-12-03
Published in Bulletin of The British Ornithologists' Club, in 1962, in volume 82, pages 72-75
Created: 2012-12-03, modified: 2012-12-03
Published in Bulletin of The British Ornithologists' Club, in 1967, in volume 87, pages 167-168
Created: 2012-12-03, modified: 2012-12-03
Published in Bulletin of The British Ornithologists' Club, in 1967, in volume 87, pages 111
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Published in Bulletin of The British Ornithologists' Club, in 1943, in volume 63, pages 63-64
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Published in Bulletin of The British Ornithologists' Club, in 1967, in volume 87, pages 61
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Published in Bulletin of The British Ornithologists' Club, in 1967, in volume 87, pages 62-63
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Published in Rhodora, in 1919, in volume 21, issue 249, pages 171
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Published in Nautilis, in 1903, in volume 17, pages 38-39
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Published in Notes From The Leyden Museum, in 1905, in volume 25, issue 4, pages 239-247
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Published in Proceedings of The Biological Society of Washington, in 1906, in volume 19, pages 121-125
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Published in Journal of Raptor Research, in 2004, in volume 38, issue 2, pages 191
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Published in Revue Suisse De Zoologie, in 1986, in volume 93, pages 237-246
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Published in Rhodora, in 2004, in volume 106, issue 927, pages 273-286
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Published in Journal of Raptor Research, in 2003, in volume 37, issue 1, pages 84-85
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