1. Safeguarding information: Instructor's period guide : state and local gas specialist schools Author(s): United States. Office of Civilian Defense, author, issuing body. Publication: Washington, D.C. : Office of Civilian Defense, March 30, 1943 Subject(s): Chemical WarfareCivil Defense -- educationGases -- standardsRespiratory Protective DevicesGas Poisoning -- prevention & controlWorld War IIUnited States
