Classification
GTAK - Hydrogeology
4
GTA - Hydrology - general
2
GTAP - Hydrological investigation methods
2
GAN - Geosciences - mathematical methods, computer applications
1
GBA - General geology, historical geology
1
GBE - Geology - endogene processes, exogene processes
1
MWH - Statistics
1
UPP - Water pollution
1
UPVC - Groundwater
1