Columbia subject headings:
Harvard subject headings:
Architecture, Modern--19th century--France--Paris.
Architecture--France--Paris--History--19th century
Architecture--France--Paris--History.
Art nouveau (Architecture)
Art nouveau--France--Paris.
Decoration and ornament, Architectural--France--Paris
Decoration and ornament--France--Paris.
Princeton subject headings:
Art nouveau--France--Paris.
Art, French--France--Paris--19th century.