Classification
UCJ - Environmental protection - general aspects
160
UED - Environmental policy
15
UCA - Environmental problems, man and environment - general aspects
14
UCL - Environmental research
10
UCE - Environmental impact, environmental pollution
9
UMV - Climatic change
8
UCG - Control of environmental pollution
7
LWV - Agriculture - plant protection
6
UAD - Environment - comprehensive works
6
UCN - Environmental education
5
UEN - Environmental economy
5
HYE - Environmental health
3
LCK - Ecology - general aspects
3
USA - Nonradioactive Waste - general aspects
3
UXL - Radiation protection - general aspects
3
YBB - Law - general
3
AEG - Official corporations - Germany
2
CT - Chemical methods of materials analysis
2
DYA - Artificial intelligence
2
EUA - Energy conservation - general
2
GBA - General geology, historical geology
2
GCAA - Regional geology - Germany
2
GRBA - Climatology - general
2
LTD - Biotechnology - comprehensive works
2
LTU - Genetic engineering
2
UCEA - Environmental impact
2
UCEB - Environmental pollution
2
UEA - Environmental policy and economy - general aspects
2
UEND - Environmental costs, environmental investments
2
UENG - Cost factors of water pollution and control
2
UENH - Cost factors of air pollution and control
2
UHP - Protection of nature and landscape
2
UKL - Environment and nuclear power
2
UMN - Air pollution control and measurement
2
UPN - Water protection, water quality, clean water
2
UPT - Water pollution control and measurement
2
URA - Soil chemistry
2
USG - Waste treatment, waste disposal
2
YEA - Environmental law
2
YRC - Technology and society
2
YZA - Politics, political science
2
CUKF - X-ray fluorescence analysis
1
CWE - Chemical engineering, chemical industry - general
1
EBA - Energy production, energy technology
1
EPK - Nuclear energy
1
ETC - Energy conversion
1
FHJ - Scanning electron microscopy, analytical electron microscopy
1
GRB - Climatology
1
GUA - Geography - general
1
LCM - Terrestrial ecology
1
more ...