Columbia subject headings:
Harvard subject headings:
Bologna (Italy)--History--19th century.
Bologna (Italy)--History--20th century.
Bologna (Italy)--Pictorial works.
Camera family.
Camera, Enrico.
Camera, Giovan Battista.
Camera, Giuseppe.
Camera, Luigi.
Princeton subject headings:
Archivio dei Fratelli Camera.
Bologna (Italy)--Social life and customs.
Photography, Artistic.