||NIOSH certified equipment list as of July 1, 1978.
||National Institute for Occupational Safety and Health. Division of Technical Services.
||Dept. of Health, Education, and Welfare, Public Health Service, Center for Disease Control, National Institute for Occupational Safety and Health : for sale by the Supt. of Docs., U.S. Govt. Print. Off.,
Industrial equipment ;
Industrial safety--United States ;
Coal mines and mining--United States--Safety measures ;
Gas masks ;
||Region 8 Technical Library/Denver,CO
||v, 88 p. : tables ; 28 cm.