Columbia subject headings:
Architecture, Romanesque--Italy--Pisa.
Battistero di San Giovanni (Pisa, Italy)
Excavations (Archaeology)--Italy--Pisa.
Pisa (Italy)--Antiquities.
Pisa (Italy)--Buildings, structures, etc.
Harvard subject headings:
Princeton subject headings:
Duomo (Pisa, Italy). Battistero.