Filtering by: Creator Great Britain. Army. General Staff. General Headquarters, Issuing body Remove constraint Creator: Great Britain. Army. General Staff. General Headquarters, Issuing body Format Pamphlets Remove constraint Format: Pamphlets Format pamphlets Remove constraint Format: pamphlets Keyword Unassigned Remove constraint Keyword: Unassigned Subject Gas masks Remove constraint Subject: Gas masks Title Defensive measures against attacks Remove constraint Title: Defensive measures against attacks