Columbia subject headings:
Harvard subject headings:
Verdun, Battle of, Verdun, France, 1916--Congresses.
World War, 1914-1918--Campaigns--Europe--Congresses.
Princeton subject headings:
Verdun, Battle of, Verdun, France, 1916--Congresses.
World War, 1914-1918--Campaigns--Europe--Congresses.