Columbia subject headings:
Fountains--Italy--Viterbo.
Sculpture, Italian--Italy--Viterbo.
Viterbo (Italy)--Buildings, structures, etc.
Harvard subject headings:
Fountains--Italy--Viterbo.
Sculpture, Italian--Italy--Viterbo.
Sculture, Italian--Italy--Viterbo.
Viterbo (Italy)--Buildings, structures, etc.
Princeton subject headings:
Fountains--Italy--Viterbo.
Sculture, Italian--Italy--Viterbo.
Viterbo (Italy)--Buildings, structures, etc.