Columbia subject headings:
Harvard subject headings:
Decoration and ornament--Art nouveau
Decorative arts--History--19th century.
Decorative arts--History--20th century.
Princeton subject headings:
Art nouveau--Europe.
Art, European--19th century.
Decoration and ornament, Architectural--Europe--History--19th century.
Decoration and ornament--Europe--Art nouveau.
Decorative arts--Europe--History--19th century.