Classification
USN - Waste water treatment
99
USNG - Waste water treatment - biological aspects
33
UPT - Water pollution control and measurement
28
UPCE - Water chemistry
23
USNH - Waste water treatment - special methods
22
UPN - Water protection, water quality, clean water
18
USK - Waste water
17
USG - Waste treatment, waste disposal
15
UCQ - Environmental technology
12
UAD - Environment - comprehensive works
10
LHH - Microbiology - methods
6
UPK - Water resources, water supply
6
CWSW - Membrane separation process
5
LHD - Microbiology - comprehensive works
5
LTH - Biotechnology - methods
5
LTN - Biotechnology - biodegradation
5
USKH - Special waste waters
5
USR - Slurry, sludge - treatment and use
5
AFW - Subject oriented organizations
4
HBM - Medical microbiology, infectious diseases
4
LHA - Microbiology - reference books, culture collections
4
UCS - Environmental chemistry
4
UPA - Water - handbooks
4
CLPS - Organic colloids, membranes
3
LTR - Bioreactor technology, fermentation
3
UPC - Water - general aspects
3
USU - Waste recycling
3
UXS - Radioactive waste management
3
CWS - Separation processes - nonmechanical
2
FGN - Nanotechnology
2
LCO - Hydrobiology
2
LCR - Ecology of microorganisms - land and water
2
LHW - Bacteria - general aspects
2
LTT - Enzyme technology, protein engineering
2
UAN - Environment - mathematical methods, computer applications
2
UCE - Environmental impact, environmental pollution
2
UCG - Control of environmental pollution
2
UPP - Water pollution
2
UPTF - Organic pollutants in water
2
UPVC - Groundwater
2
USDN - Hazardous waste - incl. waste oil
2
USGH - Contaminated sites
2
USGP - Waste treatment - other methods
2
YEC - Law on waters
2
AFG - Large scale research institutions (Helmholtz Centres)
1
AMAB - Industrial training, further education
1
CER - Macromolecular compounds - synthesis and reactions
1
CLM - Catalytic processes
1
CMDE - Photochemical reactions
1
CTS - Gas chromatography
1
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