Columbia subject headings:
Harvard subject headings:
Canals--Germany--Waldkirch--History.
Industrial water supply--Germany--Waldkirch--History.
Water use--Germany--Waldkirch--History.
Water-power--Germany--Waldkirch--History.
Princeton subject headings:
Canals--Germany--Waldkirch--History.
Industrial water supply--Germany--Waldkirch--History.
Water use--Germany--Waldkirch--History.
Water-power--Germany--Waldkirch--History.