Columbia subject headings:
Gregorietti, Salvatore, 1870-1952--Exhibitions.
Harvard subject headings:
Art nouveau--Italy--Palermo--Exhibitions.
Gregorietti, Salvatore, 1870-1952--Exhibitions.
Gregorietti, Salvatore--Exhibitions.
Princeton subject headings:
Gregorietti, Salvatore, 1870-1952--Exhibitions.