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