Columbia subject headings:
Military weapons--History--20th century.
World War, 1914-1918--Campaigns.
World War, 1914-1918--Equipment and supplies.
Harvard subject headings:
Gases, Asphyxiating and poisonous--War use--France--History--20th century.
Military weapons--History--20th century.
World War, 1914-1918--Antiquities.
World War, 1914-1918--Chemical warfare
World War, 1914-1918--Equipment and supplies
Princeton subject headings:
Gases, Asphyxiating and poisonous--War use--France--History--20th century.
Military weapons--History--20th century.
World War, 1914-1918--Antiquities.
World War, 1914-1918--Chemical warfare.
World War, 1914-1918--Equipment and supplies.