Columbia subject headings:
Cattedrale di San Lorenzo (Viterbo, Italy)
Papal Palace (Viterbo, Italy)
Harvard subject headings:
Cathedrals--Italy--Viterbo.
Cattedrale di San Lorenzo (Viterbo, Italy)
Papal Palace (Viterbo, Italy)
Viterbo (Italy)--Church history.
Viterbo (Italy)--Description and travel.
Princeton subject headings:
Cathedrals--Italy--Viterbo.
Papal Palace (Viterbo, Italy)
San Lorenzo (Cathedral : Viterbo, Italy)
Viterbo (Italy)--Church history.
Viterbo (Italy)--Description and travel.