Columbia subject headings:
Art nouveau--Italy--Palermo--Catalogs.
Art, Modern--19th century--Italy--Palermo--Catalogs.
Art, Modern--20th century--Italy--Palermo--Catalogs.
Harvard subject headings:
Architecture, Modern--19th century--Italy--Palermo.
Architecture, Modern--20th century--Italy--Palermo.
Art nouveau (Architecture)--Italy--Palermo.
Palermo (Italy)--Buildings, structures, etc.
Princeton subject headings:
Art nouveau--Italy--Palermo--Catalogs.
Art, Modern--19th century--Italy--Palermo--Catalogs.
Art, Modern--20th century--Italy--Palermo--Catalogs.