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Scientific American, Vol. 88, No. 18 (1903) (1903)
leaf 7
food is carefully analyzed, so that it may themselves to the experiments. lants, although tobacco is allowed during the experi- In order to secure the desired results, it became ments in the regular manner in which it had been used. necessary to determine a series of facts concerning The selection… … Nitrogen. © 1903 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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