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Am. Jour. Pub. Health 10: 250-254. 1920. 



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Friedenthal, H. ( ? 04). Die Bestimmung des Reaktion einer Fliissigkeit mit Hilfe 

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Mellon, E. R., Acree, S. F., Avery, Pauline M., and Slagle, E. A. ('21). The 

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Michaelis, L. ('14). Die Wasserstoffionenkonzentration. 210 pp. Berlin, 1914. 



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