Columbia subject headings:
Harvard subject headings:
France. Armée--Postal service--History--20th century.
World War, 1914-1918--France--Postal service.
World War, 1914-1918--Social aspects--France.
Princeton subject headings:
France. Armée--Postal service--History--20th century.
World War, 1914-1918--France--Postal service.
World War, 1914-1918--Social aspects--France.