Columbia subject headings:
Harvard subject headings:
Italy, Northern--Maps--Early works to 1800.
Monferrato (Italy)--Maps--Early works to 1800.
Piedmont (Italy)--Maps--Early works to 1800.
Po River Watershed (Italy)--Maps--Early works to 1800.
Princeton subject headings:
Italy, Northern--Maps--Early works to 1800.
Maps.
Monferrato (Italy)--Maps--Early works to 1800.
Piedmont (Italy)--Maps--Early works to 1800.
Po River Valley (Italy)--Maps--Early works to 1800.