Columbia subject headings:
Harvard subject headings:
First Army School of Scouting, Observation, and Sniping (Great Britain)
Sniping (Military science)
World War, 1914-1918--Great Britain
World War, 1914-1918--Personal narratives, British.
World War, 1914-1918--Trench warfare
Princeton subject headings:
Great Britain. Army--History.
Sniping (Military science)
World War, 1914-1918--Campaigns--France.