Prevalence of middle ear disorders in coal miners
By: Norma T. Hopkinson.
Contributors: National Institute for Occupational Safety and Health.
Series: DHHS publication -- no. (NIOSH) 81-101
Publisher: U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, Division of Biomedical and Behavioral Science
Place of publication: Cincinnati, Ohio