Columbia subject headings:
Crusades--13th-15th centuries.
Crusades--Finance.
Papacy--History--1309-1378.
Harvard subject headings:
Crusades--13th-15th centuries
Crusades--13th-15th centuries.
Crusades--Finance
Papacy--History--1309-1378
Princeton subject headings:
Crusades--13th-15th centuries.
Crusades--Finance.
Papacy--History--1309-1378.