Columbia subject headings:
Federico, da Montefeltro, Duke of Urbino, 1422-1482--Library--Exhibitions.
Private libraries--Italy--Urbino--Exhibitions.
Harvard subject headings:
Federico, da Montefeltro, Duke of Urbino, 1422-1482--Library--Exhibitions.
Manuscripts--Italy--Urbino--Exhibitions.
Private libraries--Italy--Urbino--History--To 1500--Exhibitions.
Princeton subject headings:
Biblioteca apostolica vaticana--Exhibitions.
Federico, da Montefeltro, Duke of Urbino, 1422-1482--Library--Exhibitions.
Manuscripts--Vatican City--Exhibitions.
Private libraries--Italy--Urbino--Exhibitions.