Angela M. Weber
National Safety Council
John A. J. Barbara
H. Ray Kirk
Ontario. Chief Medical Officer of Health.
E. C. Schroeder
C. Prowse
Namibia. Division of Public and Environmental Health Services. Subdivision Occupational Health Services
Unknown Author
United States. Occupational Safety and Health Administration
British Medical
G. V. Idelʹson
American Safety & Health Institute
John A. Zangerle
G. Pasvol
C. H. Collins
Viroj Wiwanitkit.