Columbia subject headings:
Art nouveau--Belgium--Exhibitions.
Art nouveau--France--Exhibitions.
Art, Belgian--19th century--Exhibitions.
Art, French--19th century--Exhibitions.
Harvard subject headings:
Art nouveau--Belgium--Exhibitions.
Art nouveau--France--Exhibitions.
Art, Modern--19th century--Belgium--Exhibitions.
Art, Modern--19th century--France--Exhibitions.
Princeton subject headings:
Art nouveau--Belgium--Exhibitions.
Art nouveau--France--Exhibitions.
Art, Belgian--19th century--Exhibitions.
Art, French--19th century--Exhibitions.