Trade union view and role in hearing conservation program.
D004430:Ear Protective Devices; D006317:Hearing Loss, Noise-Induced / Q000517:prevention & control; D006801:Humans; D007750:Labor Unions; D007878:Legislation as Topic; D009622:Noise / Q000517:prevention & control*; D009787:Occupational Medicine; D014481:United States