Columbia subject headings:
Harvard subject headings:
Farnese family--History.
Palazzo Farnese (Piacenza, Italy)--History.
Parma and Piacenza (Duchy)--History.
Piacenza (Italy)--Buildings, structures, etc.
Princeton subject headings:
Farnese family--History.
Palazzo Farnese (Piacenza, Italy)--History.
Parma and Piacenza (Duchy)--History.