Columbia subject headings:
Harvard subject headings:
Hydraulic engineering--Europe, Central--History.
Inland navigation--Europe, Central--History.
Water mills--Europe, Central--History.
Water use--Europe, Central--History.
Princeton subject headings:
Hydrology--Europe--History--To 1500.
Water mills--Europe--History--To 1500.
Water-supply--Europe--History--To 1500.
Water-supply--Europe--Management.