Columbia subject headings:
Harvard subject headings:
Drinking water--Germany--Munich--History.
Water conservation--Technological innovations--Germany--Munich--History.
Water quality--Germany--Munich--History.
Water-supply--Germany--Munich--History.
Princeton subject headings:
Drinking water--Germany--Munich--History.
Water conservation--Technological innovations--Germany--Munich--History.
Water quality--Germany--Munich--History.
Water-supply--Germany--Munich--History.