Columbia subject headings:
Architecture, Domestic--France--History--19th century--Congresses.
Viollet-le-Duc, Eugène-Emmanuel, 1814-1879--Congresses.
Harvard subject headings:
Princeton subject headings:
Architecture, Domestic--France--History--19th century--Congresses.
Viollet-le-Duc, Eugène-Emmanuel, 1814-1879--Congresses.