Columbia subject headings:
Architecture--Italy--Viterbo.
Art, Italian--Italy--Viterbo.
Palaces--Italy--Viterbo.
Palazzo dei Priori (Viterbo, Italy)
Harvard subject headings:
Architecture--Italy--Viterbo.
Art, Italian--Italy--Viterbo.
Palaces--Italy--Viterbo.
Palazzo dei Priori (Viterbo, Italy)
Princeton subject headings:
Palaces--Italy--Viterbo.
Palazzo dei priori (Viterbo, Italy)