Columbia subject headings:
Harvard subject headings:
Architecture--Conservation and restoration--Europe--History--19th century.
Buls, Charles, 1837-1914--Criticism and interpretation.
Historic sites--Conservation and restoration--Europe--History--19th century.
Princeton subject headings:
Architecture--Conservation and restoration--Europe--History--19th century.
Buls, Charles, 1837-1914--Criticism and interpretation.
Historic sites--Conservation and restoration--Europe--History--19th century.