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Ninth Edit., 353 pp., Leipzig, 1901. 



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Excellent — D. Van Nostrand Co., New York, 1901. 



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Geol. of Wis., Final Rept., vol. I, pt. Ill, ch. IV., Madison, 1883, pp. 668-673. 



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Cox, E. T. Porcelain, Tile and Potter's Clays. 



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