Columbia subject headings:
Natural areas--Italy--Planning--Mathematical models.
Parco del Ticino (Italy)
Parks--Italy--Planning--Mathematical models.
Parks--Planning--Environmental aspects--Italy--Mathematical models.
Recreation areas--Italy--Planning--Mathematical models.
Harvard subject headings:
Natural areas--Italy--Planning--Mathematical models.
Parco del Ticino (Italy)
Parks--Italy--Planning--Mathematical models.
Parks--Planning--Environmental aspects--Italy--Mathematical models.
Recreation areas--Italy--Planning--Mathematical models.
Princeton subject headings: