Columbia subject headings:
Ruhr River and Valley.
World War, 1914-1918--Reparations.
Harvard subject headings:
Ruhr (Germany : Region)
World War, 1914-1918--Reparations
Princeton subject headings:
France. Ministère des affaires étrangères
Ruhr River Valley (Germany)
World War, 1914-1918--Reparations.