Columbia subject headings:
Château de Pierrefonds (Pierrefonds, France)
Fortification--Conservation and restoration--France--Pierrefonds.
Pierrefonds (France)--Buildings, structures, etc.
Viollet-le-Duc, Eugène-Emmanuel, 1814-1879.
Harvard subject headings:
Architecture, Medieval--France--Pierrefonds--Conservation and restoration.
Castles--France--Pierrefonds--Conservation and restoration.
Château de Pierrefonds (Pierrefonds, France)
Viollet-le-Duc, Eugène-Emmanuel, 1814-1879
Princeton subject headings:
Architecture, Medieval--France--Pierrefonds--Conservation and restoration.
Castles--France--Pierrefonds--Conservation and restoration.
Château de Pierrefonds (Pierrefonds, France)
Viollet-le-Duc, Eugène-Emmanuel, 1814-1879.