Columbia subject headings:
Architecture--Details--Exhibitions.
Architecture--Italy--Exhibitions.
Viollet-le-Duc, Eugène-Emmanuel, 1814-1879--Exhibitions.
Harvard subject headings:
Architects--France.
Architecture--Details--Exhibitions.
Architecture--Italy--Exhibitions.
Italy--Description and travel.
Viollet-le-Duc, Eugène-Emmanuel, 1814-1879--Exhibitions.
Viollet-le-Duc, Eugène-Emmanuel, 1814-1879--Journeys.
Viollet-le-Duc, Eugène-Emmanuel, 1814-1879--Travel.
Princeton subject headings: