Columbia subject headings:
Biondo, Flavio, 1392-1459--Correspondence.
Crusades--13th-15th centuries--Sources.
Fregoso, Pietro, approximately 1417-1459--Correspondence.
Genoa (Italy)--Commerce--History.
Istanbul (Turkey)--History--Siege, 1453--Sources.
Harvard subject headings:
Biondo, Flavio, 1392-1459--Correspondence.
Crusades--13th-15th centuries--Sources.
Fregoso, Pietro, approximately 1417-1459--Correspondence.
Genoa (Italy)--Commerce--History.
Istanbul (Turkey)--History--Siege, 1453--Sources.
Princeton subject headings: