Columbia subject headings:
Harvard subject headings:
Architecture, Medieval--Italy--Pisa.
Civilization, Medieval.
Pisa (Italy)--Buildings, structures, etc.
Pisa (Italy)--Civilization.
Princeton subject headings:
Architecture, Medieval--Italy--Pisa.
Pisa (Italy)--Buildings, structures, etc.
Pisa (Italy)--Description and travel.
Pisa (Italy)--History--To 1500.