Columbia subject headings:
Burri, Alberto, 1915-1995--Exhibitions.
Piero, della Francesca, 1416?-1492--Exhibitions.
Harvard subject headings:
Burri, Alberto, 1915-1995--Anniversaries, etc.--Exhibitions.
Burri, Alberto, 1915-1995--Exhibitions.
Piero, della Francesca, 1416?-1492--Exhibitions.
Princeton subject headings:
Burri, Alberto, 1915-1995--Exhibitions.
Piero, della Francesca, 1416?-1492--Exhibitions.