Columbia subject headings:
Art galleries, Commercial--Italy--Milan--History--19th century.
Art galleries, Commercial--Italy--Milan--History--20th century.
Harvard subject headings:
Art galleries, Commercial--Italy--Milan--History--19th century.
Art galleries, Commercial--Italy--Milan--History--20th century.
Princeton subject headings:
Art galleries, Commercial--Italy--Milan--History--19th century.
Art galleries, Commercial--Italy--Milan--History--20th century.