Columbia subject headings:
Refuse and refuse disposal--New York (State)--New York.
Sewerage--New York (State)--New York.
Water-supply--New York (State)--New York.
Harvard subject headings:
New York (N.Y.)--Sewerage.
Refuse and refuse disposal--New York (State)--New York.
Sewerage--New York (State)--New York.
Water-supply--New York (State)--New York
Princeton subject headings: