Columbia subject headings:
Barbieri, Olivo, 1954---Exhibitions.
Esser, Elger, 1967---Exhibitions.
Photography, Artistic--Exhibitions.
Siena (Italy : Province)--Pictorial works--Exhibitions.
Siena (Italy)--Pictorial works--Exhibitions.
Harvard subject headings:
Barbieri, Olivo, 1954---Exhibitions.
Esser, Elger, 1967---Exhibitions.
Photography, Artistic--Exhibitions
Siena (Italy : Province)--Pictorial works--Exhibitions.
Siena (Italy)--Pictorial works--Exhibitions.
Princeton subject headings:
Barbieri, Olivo, 1954---Exhibitions.
Esser, Elger, 1967---Exhibitions.
Photography, Artistic--Exhibitions.