Columbia subject headings:
Harvard subject headings:
Cappella Palatina di Palermo.
Church architecture--Italy--Palermo.
Church doorways--Italy--Palermo.
Palermo (Italy)--Buildings, structures, etc.
Princeton subject headings:
Cappella Palatina di Palermo.
Church architecture--Italy--Palermo.
Church doorways--Italy--Palermo.
Palermo (Italy)--Buildings, structures, etc.