Classification
UPN - Water protection, water quality, clean water
12
USN - Waste water treatment
9
UPT - Water pollution control and measurement
8
USK - Waste water
6
UPCE - Water chemistry
5
AFW - Subject oriented organizations
4
UPC - Water - general aspects
3
UPA - Water - handbooks
2
UPK - Water resources, water supply
2
USKH - Special waste waters
2
USNH - Waste water treatment - special methods
2
CXW - Water and seawater desalination - chemistry and technology
1
GMAB - Hydrogeochemistry
1
GTAP - Hydrological investigation methods
1
LCO - Hydrobiology
1
UCQ - Environmental technology
1
UPTF - Organic pollutants in water
1
UPTN - Inorganic pollutants in water
1
UPVC - Groundwater
1
USDN - Hazardous waste - incl. waste oil
1
USG - Waste treatment, waste disposal
1
USNG - Waste water treatment - biological aspects
1
YEC - Law on waters
1