Columbia subject headings:
Harvard subject headings:
Architecture, Gothic--Italy--Piacenza.
Architecture, Medieval--Italy--Piacenza.
Architecture, Romanesque--Italy--Piacenza.
Christian art and symbolism--Italy--Piacenza.
Church architecture--Italy--Piacenza.
Piacenza (Italy)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Gothic--Italy--Piacenza.
Architecture, Medieval--Italy--Piacenza.
Architecture, Romanesque--Italy--Piacenza.
Christian art and symbolism--Italy--Piacenza.
Church architecture--Italy--Piacenza.
Piacenza (Italy)--Buildings, structures, etc.