Columbia subject headings:
Balearic Islands (Spain)--History, Military--Early works to 1800.
Catalonia (Spain)--History, Military--Early works to 1800.
Christianity and other religions--Islam--Early works to 1800.
Crusades--Early works to 1800.
Islam--Relations--Christianity--Early works to 1800.
Pisa (Italy)--History, Military--Early works to 1800.
Harvard subject headings:
Balearic Islands (Spain)--History, Military--Early works to 1800.
Catalonia (Spain)--History, Military--Early works to 1800.
Christianity and other religions--Islam--Early works to 1800
Crusades--Early works to 1800
Islam--Relations--Christianity--Early works to 1800
Majorca (Spain)--History--Poetry.
Pisa (Italy)--History, Military--Early works to 1800.
Spain--History--711-1516--Poetry.
Princeton subject headings:
Balearic Islands (Spain)--History, Military--Early works to 1800.
Catalonia (Spain)--History, Military--Early works to 1800.
Christianity and other religions--Islam--Early works to 1800.
Crusades--Early works to 1800.
Islam--Relations--Christianity--Early works to 1800.
Pisa (Italy)--History, Military--Early works to 1800.