Columbia subject headings:
Groundwater flow--Mathematical models.
Groundwater--Management--Mathematical models.
Groundwater--Quality--Mathematical models.
Harvard subject headings:
Groundwater flow--Mathematical models
Groundwater--Management--Mathematical models.
Groundwater--Quality--Mathematical models.
Princeton subject headings:
Groundwater flow--Mathematical models.
Groundwater--Management--Mathematical models.
Groundwater--Quality--Mathematical models.