Columbia subject headings:
Harvard subject headings:
Cities and towns--Europe--History--Congresses
Municipal water supply--Europe--History--Congresses.
Wells--Europe--History--Congresses.
Princeton subject headings:
Brunnen--Stadt--Geschichte 1300-1850--Kongress--Bern <2005>
Cities and towns--Europe--History--Congresses.
Fountains--Europe--History--Congresses.
Stadt--Brunnen--Geschichte 1300-1850--Kongress--Bern <2005>