Classification
USR - Slurry, sludge - treatment and use
13
USNG - Waste water treatment - biological aspects
9
USK - Waste water
6
USN - Waste water treatment
6
LWH - Agriculture - soil sciences
3
UPP - Water pollution
3
GPA - Geobiology - general
2
LHH - Microbiology - methods
2
LTN - Biotechnology - biodegradation
2
LWE - Agriculture - general aspects
2
UPN - Water protection, water quality, clean water
2
USDE - Domestic waste, plastics, paper
2
USG - Waste treatment, waste disposal
2
USNH - Waste water treatment - special methods
2
UVW - Special effects of hazardous materials
2
CWE - Chemical engineering, chemical industry - general
1
GMA - Geochemistry - general
1
GNA - Geology - soil sciences
1
LCM - Terrestrial ecology
1
LCN - Ecology - soil sciences
1
LCR - Ecology of microorganisms - land and water
1
LGL - Zoology - general aspects
1
LHL - Microbiology - general aspects
1
LHW - Bacteria - general aspects
1
LTH - Biotechnology - methods
1
LTR - Bioreactor technology, fermentation
1
TGN - Control engineering
1
UA - Environment - general
1
UAN - Environment - mathematical methods, computer applications
1
UCG - Control of environmental pollution
1
UCQ - Environmental technology
1
UPT - Water pollution control and measurement
1
USD - Solid waste
1
USKH - Special waste waters
1
USU - Waste recycling
1
UVR - Environmental aspects of halogens and halogenated hydrocarbons
1