Charles E. Whitcher, Donald C. Zimmerman, Robert L. Piziali
U.S. Dept. of Health, Education, and Welfare, Public Health Service, Center for Disease Control, National Institute for Occupational Safety and Health, Division of Surveillance, Hazard Evaluation and Field Studies , For sale by the Superintendent of Documents, U.S. Govt. Print. Off.
1977
DHEW publication
no. (NIOSH) 77-171
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