References
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- Elkins , H. B. 1950 . Chemistry of Industrial Toxicology , New York : John Wiley and Sons, Inc. .
- Fassett , D. W. Rochester , New York : Eastman Kodak Company . Personal Communication
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- Smyth , Henry F. 1956 . Improved Communication—Hygienic Standards for Daily Inhalation . AIHA Quarterly , 17 : 129