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Phytochemie - Rochleder, Friedrich, 1819 -1874 (W. Engelmann, 1854)

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Plant & eat vegetables for health : 1936, forty-third annual catalog - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Aggeler & Musser Seed Co, 1936)

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Plant-geography upon a physiological basis. Translated by W.R. Fisher; rev. and edited by Percy Groom and I.B. Balfour - Schimper, A. F. W. (Andreas Franz Wilhelm), 1856 -1901 (Clarendon Press, 1903)