Columbia subject headings:
World War, 1914-1918--Pictorial works.
World War, 1914-1918--Study and teaching--European Union countries--Congresses.
Harvard subject headings:
World War, 1914-1918--Pictorial works
World War, 1914-1918--Study and teaching--European Union countries--Congresses.
Princeton subject headings:
World War, 1914-1918--Education and the war--Congresses.
World War, 1914-1918--Study and teaching--European Union countries--Congresses.
World War, 1914-1918--Textbooks--Congresses.