Columbia subject headings:
Architecture--Conservation and restoration--France--Exhibitions.
Viollet-le-Duc, Eugène-Emmanuel, 1814-1879--Exhibitions.
Harvard subject headings:
Viollet-le-Duc, Eugène-Emmanuel, 1814-1879--Exhibitions.
Princeton subject headings:
Viollet-le-Duc, Eugène-Emmanuel, 1814-1879--Exhibitions.