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Published in Journal of Raptor Research, in 1991, in volume 25, issue 3, pages 96
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Published in Annals And Magazine of Natural History, in 1890, in volume 5, pages 256-257
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Published in Virginia Journal of Science NS, in 1960, in volume 11, pages 53-77
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Published in Journal of Raptor Research, in 2002, in volume 36, issue 1, pages 58-65
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