Classification
USR - Slurry, sludge - treatment and use
13
UA - Environment - general
5
USN - Waste water treatment
5
UXS - Radioactive waste management
4
CWE - Chemical engineering, chemical industry - general
2
UPCE - Water chemistry
2
UPP - Water pollution
2
USG - Waste treatment, waste disposal
2
USK - Waste water
2
USNG - Waste water treatment - biological aspects
2
UXV - Radioactive waste disposal - interim and final
2
CHRV - Water and its properties
1
CWB - Chemical engineering - comprehensive works
1
THD - Design and construction in mechanical engineering
1
TNB - Nuclear power plants
1
UCJ - Environmental protection - general aspects
1
UNA - Noise pollution
1
UPK - Water resources, water supply
1
UPN - Water protection, water quality, clean water
1
UPT - Water pollution control and measurement
1
UPTF - Organic pollutants in water
1
UPTK - Volatile pollutants in water
1
UPTN - Inorganic pollutants in water
1
USD - Solid waste
1
USDN - Hazardous waste - incl. waste oil
1
USKH - Special waste waters
1
USNH - Waste water treatment - special methods
1
USU - Waste recycling
1
UXA - Environmental radioactivity
1
YEC - Law on waters
1