title: Further discussion of NRRs.
authors.forename: Jay A
authors.initials: JA
authors.lastname: Parker
mesh_terms: D004430:Ear Protective Devices / Q000592:standards*; D006317:Hearing Loss, Noise-Induced / Q000517:prevention & control*; D006801:Humans; D009784:Occupational Diseases / Q000517:prevention & control*; D016272:Occupational Health; D014481:United States; D014489:United States Occupational Safety and Health Administration