Columbia subject headings:
Donzelli, Pietro--Exhibitions.
Photography, Artistic--Exhibitions.
Po River Delta (Italy)--Pictorial works--Exhibitions.
Harvard subject headings:
Donzelli, Pietro--Exhibitions.
Landscape photography--Exhibitions.
Parco del Delta del Po (Italy)--In art.
Photography, Artistic--Exhibitions
Princeton subject headings:
Donzelli, Pietro--Exhibitions.
Photography, Artistic--Exhibitions.
Po River Delta (Italy)--Pictorial works--Exhibitions.