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Published in Bulletin of The African Bird Club, in 2005, in volume 12, issue 1, pages 40-41
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Published in Heathers : yearbook of the Heather Society, in 1999, in volume 1999, pages 36-42
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Published in The Auk, in 1911, in volume 28, pages 179-188
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Published in Madroño, in 1972, in volume 21, issue 5, pages 265-267
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