Columbia subject headings:
Harvard subject headings:
Railroads--France--Employees--History--20th century.
Railroads--France--History--20th century.
World War, 1939-1945--Transportation.
World War, 1939-1945--Underground movements--France.
Princeton subject headings:
Railroads--France--History--20th century.
World War, 1939-1945--Transportation.
World War, 1939-1945--Underground movements--France.