[40] Garner, W. W.: _The Relation of Nicotin to the Burning Quality of
Tobacco_, U. S. Department of Agriculture, Bureau of Plant Industry,
Bulletin No. 141, Sept. 30, 1909, p. 15; _A New Method for the
Determination of Nicotin in Tobacco_, U. S. Department of Agriculture,
Bureau of Plant Industry, Bulletin No. 102, July 6, 1907, p. 12.
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