Columbia subject headings:
Art and photography--Congresses.
Photography, Artistic--History--Congresses.
Photography--History--Congresses.
Harvard subject headings:
Art and photography--Congresses.
Photography--Spain--Castilla-La Mancha--History--Congresses.
Princeton subject headings:
Art and photography--Congresses.
Photography, Artistic--History--Congresses.
Photography--History--Congresses.