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Published in Palaeontology, in 1989, in volume 32, issue 2, pages 313-323

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Published in Palaeontology, in 1964, in volume 7, issue 2, pages 286-305

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Published in Palaeontology, in 1982, in volume 25, issue 2, pages 439-442

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Published in Palaeontology, in 1962, in volume 5, issue 1, pages 86-92

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Published in Phegea, in 1985, in volume 13, issue 3, pages 92

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Published in Rhodora, in 1966, in volume 68, issue 776, pages 420-428

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Published in Madroño, in 1952, in volume 11, issue 8, pages 308-309

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Published in Botanical Museum Leaflets, Harvard University, in 1940, in volume 8, pages 121-128

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Published in Asa Gray correspondence. Senders E, 1838-1898 (inclusive), in 1865, pages 1

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