TY - GEN AU - Boonstra, J. AU - De Ridder, N.A. TI - Numerical modelling of groundwater basins : a user-oriented manual SN - 9070260697 PY - 1981/// CY - Wageningen PB - ILRI KW - HYDROLOGY-GROUNDWATER KW - WATER RESOURCES-MODELLING KW - HYDROLOGY KW - HYDROGEOLOGY KW - NUMERICAL MODELLING KW - GROUNDWATER BASINS-MODELLING ER -