Filtering by: Creator Great Britain. Army. General Staff. General Headquarters, Issuing body Remove constraint Creator: Great Britain. Army. General Staff. General Headquarters, Issuing body Keyword Unassigned Remove constraint Keyword: Unassigned Subject Gas masks Remove constraint Subject: Gas masks Subject World war, 1914-1918--Pamphlets Remove constraint Subject: World war, 1914-1918--Pamphlets Title Defensive measures against attacks Remove constraint Title: Defensive measures against attacks