Columbia subject headings:
Art nouveau--Europe.
Illustration of books--Europe--19th century.
Illustration of books--Europe--20th century.
Harvard subject headings:
Decoration and ornament--Art nouveau
Illustration of books--19th century
Illustration of books--20th century
Princeton subject headings:
Art nouveau.
Decoration and ornament--Art nouveau.
Illustration of books--19th century.
Illustration of books--20th century.