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• American Conference of Government Industrial Hygienists
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  Threshold Limit Values and Biological Exposure Indices for 1989-1990.
  American Conference of Government Industrial Hygienists, Cincinnati, OH
  Threshold Limit Values and Biological Exposure Indices for 1989-1990. 2nd Printing, Am. Conf. of Govt. Industrial Hygienists, OH, 128 p., 1989