. The isolation of harmful organic substances from soils. Fig. 1.—Crystals of Picoline Carboxylic Acid Obtained from Soils, Formedfrom a Dilute Aqueous Fig. 2.—Crystals of Picoline Carboxylic Acid Obtained from Soils, Formedfrom a Concentrated Aqueous Solution. Bui. 53, Bureau of Soils, U. S. Dept. of Agriculture. Plate II.

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