References
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- 1970 Threshold Limit Values for Airborne Contaminants . American Conference of Governmental Industrial Hygienists . Cincinnati, OH : ACGIH .
- U.S. Department of Labor, Occupational Safety and Health Administration . July 1991 . OSHA Instruction CPL 2–2.43. The Chemical Information Manual July , Washington, DC : USDOL/OSHA .
- U.S. Department of Labor, Occupational Safety and Health Administration . April 1993 . OSHA Instruction CPL 2.20B. The OSHA Technical Manual April , Washington, DC : USDOL/OSHA .
- Rice , C. , Harris , R. L. , Lumsden , J. C. and Symons , M. J. 1984 . Reconstruction of Silica Exposure in North Carolina Dusty Trades . Am. Ind. Hyg. Assoc. J. , 45 ( 10 ) : 689 – 696 .
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