Columbia subject headings:
Gardens in art--Exhibitions.
Gardens, Baroque--Italy--Piacenza--Exhibitions.
Gardens--Italy--Piacenza--Designs and plans--Exhibitions.
Gardens--Italy--Piacenza--History--17th-19th centuries--Exhibitions.
Landscape architecture--Italy--Piacenza.
Harvard subject headings:
Gardens in art--Exhibitions.
Gardens--Italy--Piacenza--History--Exhibitions.
Princeton subject headings:
Gardens in art--Exhibitions.
Gardens, Baroque--Italy--Piacenza--Exhibitions.
Gardens--Italy--Piacenza--Designs and plans--Exhibitions.
Gardens--Italy--Piacenza--History--17th-19th centuries--Exhibitions.
Landscape architecture--Italy--Piacenza.