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