Columbia subject headings:
Architecture, Gothic--Italy--Palermo.
Architecture--Italy--Palermo.
Church architecture--Italy--Palermo.
Palermo (Italy)--Buildings, structures, etc.
Harvard subject headings:
Architecture, Gothic--Italy--Palermo.
Architecture--Italy--Palermo.
Church architecture--Italy--Palermo.
Palermo (Italy)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Gothic--Italy--Palermo.
Architecture--Italy--Palermo.
Church architecture--Italy--Palermo.
Palermo (Italy)--Buildings, structures, etc.