Columbia subject headings:
Architecture, Renaissance--Italy--Viterbo.
Church architecture--Italy--Viterbo.
Viterbo (Italy)--Buildings, structures, etc.
Harvard subject headings:
Architecture, Renaissance--Italy--Viterbo.
Art, Renaissance--Italy--Viterbo.
Viterbo (Italy)--History.
Princeton subject headings:
Architecture, Renaissance--Italy--Viterbo.
Church architecture--Italy--Viterbo.
Viterbo (Italy)--Buildings, structures, etc.