Noise Comparison of Coal Mine Occupational Exposures Collected at Two Threshold Sound Levels Reported Noise-Induced Hearing Loss Among Miners The Effect of Selected Theoretical Distributions of Sound Levels on the Calculated Noise Dose FAQs | Freedom of Information Act | Privacy & Security Statement | Disclaimers | Customer Survey | Online Filing Help Desk | Contact Us Mine Safety and Health Administration (MSHA) | 1100 Wilson Boulevard, 21st Floor Arlington, VA 22209-3939 www.msha.gov | Telephone: (202) 693-9400 | Fax-on-demand: (202) 693-9401