Columbia subject headings:
Paris (France)--History--1940-1944.
Postal service--France--Paris--History.
World War, 1939-1945--France--Paris.
World War, 1939-1945--Postal service.
World War, 1939-1945--Underground movements--France--Paris.
Harvard subject headings:
Postal service--France--Paris--History--20th century.
World War, 1939-1945--Postal service--History.
Princeton subject headings:
Postal service--France--Paris--History.
World War, 1939-1945--Postal service.
World War, 1939-1945--Underground movements--France--Paris.