A real-ear field method for the measurement of the noise attenuation of insert-type hearing protectors / P.L. Michael [and others] ; Environmental Acoustics Laboratory, Pennsylvania State University

Published:: Cincinnati, Ohio : U.S. Dept. of Health, Education, and Welfare, Public Health Service, Center for Disease Control, National Institute for Occupational Safety and Health, Division of Biomedical and Behavioral Science, 1976.
Washington : For sale by the Supt. of Docs., U.S. Govt. Print. Off.
Physical Description:: 177 pages in various pagings : illustrations ; 28 cm.
Additional Creators:: Michael, P. L., National Institute for Occupational Safety and Health. Division of Biomedical and Behavioral Science, and Pennsylvania State University. Environmental Acoustics Laboratory