Columbia subject headings:
Harvard subject headings:
Hydraulic structures--Italy--Lombardy--History.
Lombardy (Italy)--Economic conditions.
Nature--Effect of human beings on--Italy--Lombardy--History.
Water resources development--Italy--Lombardy--History.
Water use--Italy--Lombardy--History.
Princeton subject headings:
Hydraulic structures--Italy--Lombardy--History.
Lombardy (Italy)--Economic conditions.
Nature--Effect of human beings on--Italy--Lombardy--History.
Water resources development--Italy--Lombardy--History.