Columbia subject headings:
Belgium--History--German occupation, 1914-1918.
Military occupation.
World War, 1914-1918--Germany.
Harvard subject headings:
Belgium--History--German occupation, 1914-1918.
Military occupation
World War, 1914-1918--Germany.
Princeton subject headings:
Belgium--History--German occupation, 1914-1918.
Military occupation.
World War, 1914-1918--Germany.