Columbia subject headings:
Landscape architecture--Italy--Po River Delta.
Po River Delta (Italy)
Regional planning--Environmental aspects--Italy--Po River Delta.
Stream conservation--Italy--Po River Delta.
Sustainable development--Italy--Po River Delta.
Harvard subject headings:
Landscape architecture--Italy--Po River Delta.
Po River Delta (Italy)
Regional planning--Environmental aspects--Italy--Po River Delta.
Stream conservation--Italy--Po River Delta.
Sustainable development--Italy--Po River Delta.
Princeton subject headings: