Columbia subject headings:
Harvard subject headings:
Belgium--History--German occupation, 1914-1918.
Germans--Belgium--History--20th century.
World War, 1914-1918--Collaborationists--Belgium.
Princeton subject headings:
Belgium--History--German occupation, 1914-1918.
Germans--Belgium--History--20th century.
World War, 1914-1918--Collaborationists--Belgium.