Classification
UPT - Water pollution control and measurement
7
UPC - Water - general aspects
5
UA - Environment - general
4
UPCE - Water chemistry
4
UPP - Water pollution
3
CT - Chemical methods of materials analysis
2
UPN - Water protection, water quality, clean water
2
CHRV - Water and its properties
1
LCO - Hydrobiology
1
USK - Waste water
1
USR - Slurry, sludge - treatment and use
1
UVF - Environmental aspects of heavy metals and their compounds
1