Columbia subject headings:
Harvard subject headings:
Eyck, Jan van, 1390-1440. Ghent altarpiece.
Piero, della Francesca, 1416?-1492--Criticism and interpretation.
Princeton subject headings:
Altarpieces--Conservation and restoration--Belgium--Ghent.
Piero, della Francesca, 1416?-1492--Criticism and interpretation.