Bulletin of the of Agriculture . A Thin Film of a Mixture of Equal Parts, by Volume, of Creosote and aNormal Gas-House Tar No. 3 (Normal Amount of Free Carbon in Tar, 30Per Cent, by Weight). Magnification, about 400 diameters. Bui. 607, U. S. Dept. of Agriculture. Plate ft]

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear