Columbia subject headings:
Architecture--Italy--Viterbo.
Streets--Italy--Viterbo--Via Farnesiana.
Viterbo (Italy)--Buildings, structures, etc.
Viterbo (Italy)--Description and travel.
Harvard subject headings:
Princeton subject headings:
Architecture--Italy--Viterbo.
Via Cavour (Viterbo, Italy)
Viterbo (Italy)--Buildings, structures, etc.