Columbia subject headings:
Italy--Pictorial works--Exhibitions.
Photography--Italy--History--19th century--Exhibitions.
Sommer, Giorgio, 1834-1914--Exhibitions.
Harvard subject headings:
Italy--Pictorial works--Exhibitions.
Photography--Italy--History--19th century--Exhibitions.
Sommer, Giorgio, 1834-1914--Exhibitions.
Princeton subject headings:
Historic sites--Italy--Pictorial works--Exhibitions.
Italy--Pictorial works--Exhibitions.
Photography, Artistic--Exhibitions.
Photography--Italy--History--19th century--Exhibitions.
Sommer, Giorgio, 1834-1914--Exhibitions.