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Published in Annals of the Missouri Botanical Garden, in 1974, in volume 61, pages 427-461
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Published in Bulletin of The British Ornithologists' Club, in 1968, in volume 88, pages 90-93
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Published in Great Basin Naturalist, in 1971, in volume 31, pages 256-260
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Published in The Wilson Bulletin, in 2000, in volume 112, issue 2, pages 225-232
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