Columbia subject headings:
Canada. Canadian Army. Canadian Corps--History.
Gases, Asphyxiating and poisonous--War use.
World War, 1914-1918--Chemical warfare.
World War, 1914-1918--Regimental histories--Canada.
Harvard subject headings:
Canada. Canadian Army. Canadian Corps--History.
Gases, Asphyxiating and poisonous--War use.
World War, 1914-1918--Chemical warfare
World War, 1914-1918--Regimental histories--Canada
Princeton subject headings:
Canada. Canadian Army--History--World War, 1914-1918.
Gases, Asphyxiating and poisonous--War use.
World War, 1914-1918--Chemical warfare.
World War, 1914-1918--Personal narratives, Canadian.