References
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- Occupational Safety and Health Administration . 1981 . Final regulatory analysis of the hearing conservation amendment , 1 – 3 . Department of Labor . GPO No. 723–860/752
- Schmidek , M. E. , Layne , M. A. , Lempert , B. L. and Fleming , R. F. 1975 . Survey of hearing conservation programs in industry , HEW publication no. NIOSH 75–178 Cincinnati, Ohio : National Institute for Occupational Safety and Health .
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- Lempert , B. L. and Edwards , R. G. 1983 . Field investigations of noise reduction afforded by insert-type hearing protectors . Am Ind Hyg Assoc J , 12 : 894 – 902 .