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Dec 10, 2017 - Ullmann's Encyclopedia of Industrial Chemistry, 6th Ed. 2000 ...... 500 m²/g or from 400 to 40 are described, for example, in Ullmann's Enzyklopädie der. 500 m´/g or from 425 to 500 m²/g. Technischen Chemie, 4th Edition, Vol.