Columbia subject headings:
Groundwater--Pollution.
Harvard subject headings:
Aquifer storage recovery--Congresses.
Aquifer storage recovery.
Groundwater--Pollution
Groundwater--Pollution--Congresses
Water--Pollution potential
Water--Pollution potential--Congresses.
Wellhead protection--Congresses.
Wellhead protection.
Princeton subject headings:
Aquifer storage recovery.
Groundwater--Pollution.
Water--Pollution potential.
Wellhead protection.