Columbia subject headings:
Geological Survey (U.S.). Water Resources Division. Ohio District--Periodicals.
Hydrology--Ohio--Periodicals.
Water-supply--Ohio--Periodicals.
Harvard subject headings:
Geological Survey (U.S.). Water Resources Division. Ohio District--Periodicals.
Hydrology--Ohio--Periodicals.
Water-supply--Ohio--Periodicals.
Princeton subject headings: