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Biophysical overview, significant, sensitive and disturbance features of the Eagle Butte sensitive area - Geowest Environmental Consultants Ltd. (GEOWEST Environmental Consultants Ltd, 1996)

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Flora of Indiana - Deam, Charles Clemon, 1865 -1953 (Wm. B. Burford printing co., contractor for state printing and binding, 1940)

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A flora of Valentine Eastern Sierra Reserve - Howald, Ann M. (The Herbarium, Department of Biological Sciences, University of California, Santa Barbara, 1981)

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Syllogeus - National Museum of Natural Sciences (Canada) (National Museum of Natural Sciences, 1978)

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Syllogeus - National Museum of Natural Sciences (Canada) (National Museum of Natural Sciences, 1981)

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