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Published in Asa Gray correspondence. Senders A, in 1864, pages 1
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Published in Asa Gray correspondence. Senders A, in 1866, pages 1-2
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Published in Asa Gray correspondence. Senders A, in 1873, pages 1-2
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Published in Asa Gray correspondence. Senders A, in 1876, pages 1-2
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Published in Asa Gray correspondence. Senders A, in 1877, pages 1-4
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Published in Asa Gray correspondence. Senders A, in 1875, pages 1-2
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Published in Asa Gray correspondence. Senders A, in 1888, pages 1-3
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Published in Botanical Gazette, in 1887, in volume 12, issue 8, pages 192
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Published in Annals of the Missouri Botanical Garden, in 1953, in volume 40, pages 33-41
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Published in Annals of the Missouri Botanical Garden, in 1948, in volume 35, pages 255-268
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Published in Biol Bull, in 1952, in volume 102, pages 185-199
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Published in Biol Bull, in 1978, in volume 154, pages 1-14
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