T.A. Ryan
Philip Wehner
Great Britain. Factory Inspectorate.
Gordon Sellers
Robert Stewart Bly
Franz Horak
Raffaele Giuliano
D. D. Berolzheimer
Paul McDonald Fye
Thomas Herman Manninen
Sheridan Delépine
Great Britain. Explosive Supply, Department of.
Ohio. Department of Health
Great Britain. HM Factory Inspectorate
Unknown Author
Lawrence Adna Weber
L. Cotarca
Great Britain. HM Factory Inspectorate.
National Institute for Occupational Safety and Health. Office of Research and Standards Development