Columbia subject headings:
Harvard subject headings:
Architecture, Modern--17th-18th centuries--Italy--Piacenza.
Palaces--Italy--Piacenza.
Piacenza (Italy)--Buildings, structures, etc.
Princeton subject headings:
Architecture--Italy--Piacenza--17th century.
Architecture--Italy--Piacenza--18th century.
Palaces--Italy--Piacenza.
Piacenza (Italy)--Buildings, structures, etc.