Filtering by: Creator Great Britain. Army. General Staff. General Headquarters, Issuing body Remove constraint Creator: Great Britain. Army. General Staff. General Headquarters, Issuing body Type Work Remove constraint Type: Work Keyword Unassigned Remove constraint Keyword: Unassigned Language English Remove constraint Language: English Subject Gas masks Remove constraint Subject: Gas masks Subject World war, 1914-1918--Pamphlets Remove constraint Subject: World war, 1914-1918--Pamphlets