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 Language English Remove constraint Language: English Resource type text Remove constraint Resource type: text Subject Gas masks Remove constraint Subject: Gas masks Subject World war, 1914-1918--Pamphlets Remove constraint Subject: World war, 1914-1918--Pamphlets