Classification
USN - Waste water treatment
2
AEG - Official corporations - Germany
1
UAD - Environment - comprehensive works
1
UCE - Environmental impact, environmental pollution
1
UCEB - Environmental pollution
1
UCQ - Environmental technology
1
UEG - Environmental programs and expertises
1
UMN - Air pollution control and measurement
1
UPCE - Water chemistry
1
UPT - Water pollution control and measurement
1
USK - Waste water
1
USR - Slurry, sludge - treatment and use
1
UVFD - Environmental aspects of specific heavy metals - cadmium, lead, mercury
1