Classification
UPN - Water protection, water quality, clean water
28
UPCE - Water chemistry
6
UPK - Water resources, water supply
5
UPC - Water - general aspects
3
UPP - Water pollution
3
UPT - Water pollution control and measurement
3
UPVC - Groundwater
3
UMG - Technology of clean air
2
CMDS - Photochemical processes in nature and technology
1
CWE - Chemical engineering, chemical industry - general
1
FGN - Nanotechnology
1
FNPE - Nanostructured materials
1
GMAB - Hydrogeochemistry
1
GPAB - Flora, vegetation - geographical aspects
1
UCE - Environmental impact, environmental pollution
1
UPA - Water - handbooks
1
UPPE - Biological indicators of water pollution
1
UPW - Drinking water
1
USNG - Waste water treatment - biological aspects
1
USR - Slurry, sludge - treatment and use
1