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Published in The Auk, in 1911, in volume 28, pages 304-319

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Published in Veliger, in 1961, in volume 4, pages 64-69

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Published in Proceedings of The American Philosophical Society, in 1887, in volume 24, issue 125, pages 19-23

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Published in Journal of Raptor Research, in 1988, in volume 22, issue 2, pages 73

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Published in Madroño, in 1964, in volume 17, issue 7, pages 227-230

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