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Published in Journal of The Arnold Arboretum, in 1979, in volume 60, issue 4, pages 477-503
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Published in The Auk, in 1906, in volume 23, pages 241-242
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Published in Journal of the Arnold Arboretum, in 1981, in volume 62, pages 63-128,
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Published in Proceedings of The Biological Society of Washington, in 1900, in volume 13, pages 47-51
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Published in Rhodora, in 1984, in volume 86, pages 381-387
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Published in Journal of the Arnold Arboretum, in 1984, in volume 65, pages 255-342
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Published in The Auk, in 1899, in volume 16, pages 294-295
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Published in The Auk, in 1906, in volume 23, pages 119-120
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