Columbia subject headings:
Art auctions--Italy.
Art, Modern--20th century.
Auctioneers--Italy--Biography.
Porro, Casimiro.
Harvard subject headings:
Art auctions--Italy.
Art, Modern--20th century
Auctioneers--Italy--Biography.
Porro, Casimiro
Princeton subject headings:
Art auctions--Italy.
Art, Modern--20th century.
Auctioneers--Italy--Biography.
Porro, Casimiro.