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7.0 REFERENCES <br /> American Conference of Governmental Industrial Hygienists. 1993. 1993-1994 Threshold Limit Values <br /> for Chemical Substances and Physical Agents and Biological Exposure Indices. <br /> U.S.Department of Health and Human Services. 1994.NIOSH Pocket Guide to Chemical Hazards. <br /> Prepared by U.S.Department of Health and Human Services,Public Health Service,Centers for <br /> Disease Control,and National Institute for Occupational Safety and Health. June 1994. <br /> 16 <br />