References
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- Drinker , P. , Thomson , R. M. and Finn , J. L. 1927 . J. Ind. Hyg. , 9 : 98
- Moskowitz , S. and Burke , W. J. 1938 . N. Y. State Ind. Bull , 17 : 492
- Sturgis , C. C. , Drinker , P. and Thomson , R. M. 1927 . J. Ind. Hyg. , 9 : 88