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2. Strong, F. M., and Carpenter, L. E., ibid., 14, 909 (1942).
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4. Snell, E. E., and Strong, F. M., Indust. Eng. Chem., Anal. Ed., 11, 346 (1939).
5. Snell, E. E., and Strong, F. M., Univ. Texas Publication No. 4137 (1941).