Columbia subject headings:
Harvard subject headings:
Canals--Italy--Romagna--Planning--History--16th century.
Economic development projects--Italy--Romagna--History--16th century.
Julius II, Pope, 1443-1513.
Water resources development--Italy--Romagna--History--16th century.
Princeton subject headings:
Julius II, Pope, 1443-1513.
Regional planning--Italy--Romagna.