Columbia subject headings:
Harvard subject headings:
Aqueducts--Germany--History.
Archaeology, Medieval--Germany.
Dams--Germany--History.
Germany--Antiquities.
Hydraulic engineering--Germany--History.
Water-supply engineering--Germany--History.
Princeton subject headings:
Aqueducts--Germany--History.
Archaeology, Medieval--Germany.
Dams--Germany--History.
Germany--Antiquities.
Hydraulic engineering--Germany--History.
Water-supply engineering--Germany--History.