Columbia subject headings:
Harvard subject headings:
Architecture--Italy--Pisa--History.
Campo santo di Pisa.
Duomo (Pisa, Italy)
Pisa (Italy)--Buildings, structures, etc.--History.
Princeton subject headings:
Baptisteries--Italy--Pisa.
Christian art and symbolism--Italy--Pisa--Medieval, 500-1500.
Duomo (Pisa, Italy)
Leaning Tower (Pisa, Italy)
Piazza dei Miracoli (Pisa, Italy)
Pisa (Italy)--Buildings, structures, etc.