Columbia subject headings:
Armored trains--France--History--19th century.
Armored trains--France--History--20th century.
Harvard subject headings:
Armored trains--France--History--19th century.
Armored trains--France--History--20th century.
Princeton subject headings:
Armored trains--France.--History.--19th century.
Armored trains--France.--History.--20th century.