Columbia subject headings:
Dürer, Albrecht, 1471-1528--Exhibitions.
Portrait painting--Exhibitions.
Van Dyck, Anthony, 1599-1641--Exhibitions.
Warhol, Andy, 1928-1987--Exhibitions.
Harvard subject headings:
Portraits--History--Exhibitions.
Portraits--Philosophy--Exhibitions.
Portraits--Political aspects--Exhibitions.
Portraits--Psychological aspects--Exhibitions.
Princeton subject headings:
Portraits--History--Exhibitions.
Portraits--Philosophy--Exhibitions.
Portraits--Political aspects--Exhibitions.
Portraits--Psychological aspects--Exhibitions.