Columbia subject headings:
Piacenza (Italy)--Buildings, structures, etc.--History--Sources.
Piacenza (Italy)--History--Sources.
Harvard subject headings:
Architecture, Domestic--Italy--Piacenza--History--Sources.
Architecture--Italy--Piacenza--History--Sources.
Piacenza (Italy)--Buildings, structures, etc.--History--Sources.
Piacenza (Italy)--History--Sources.
Princeton subject headings:
Architecture--Italy--Piacenza.
Piacenza (Italy)--Buildings, structures, etc.--History--Sources.
Piacenza (Italy)--Church history--Early works to 1800.
Piacenza (Italy)--Civilization.