Columbia subject headings:
Harvard subject headings:
Allier River (France)--Description and travel.
Allier River Valley (France)--Description and travel.
Bridges--France--Design and construction--History.
Bridges--France--History.
Princeton subject headings:
Allier River (France)--Description and travel.
Allier River Valley (France)--Description and travel.
Bridges--Design and construction--France--History.
Bridges--France--History.