Classification
UEN - Environmental economy
181
UEF - Sustainability
24
UED - Environmental policy
11
YPB - Economy - general aspects
7
UEND - Environmental costs, environmental investments
6
UMV - Climatic change
6
USU - Waste recycling
6
YPO - Economic policy
6
UCJ - Environmental protection - general aspects
5
UEA - Environmental policy and economy - general aspects
5
EWA - Energy economy
3
LWO - Agricultural ecology, sustainable agriculture
3
UCA - Environmental problems, man and environment - general aspects
3
UCG - Control of environmental pollution
3
UENH - Cost factors of air pollution and control
3
YPG - Business management
3
YPW - Economy of industry branches
3
GWA - Raw material economy, raw material policy
2
GWB - Raw materials - metals, nonmetals
2
GWBB - Raw material supply, raw material demand
2
LCK - Ecology - general aspects
2
UAN - Environment - mathematical methods, computer applications
2
UCL - Environmental research
2
UEG - Environmental programs and expertises
2
UENG - Cost factors of water pollution and control
2
UKE - Environment and energy resources
2
UMN - Air pollution control and measurement
2
YPGB - Process management
2
YRC - Technology and society
2
YRG - Technology transfer
2
ECA - Energy resources
1
EFA - Petroleum, natural gas
1
EKA - Wind energy
1
EVP - Energy models, energy system analysis
1
GCAB - Regional geology - european countries
1
GRBN - Climatological models
1
LCD - Ecology - comprensive works
1
LCN - Ecology - soil sciences
1
LWE - Agriculture - general aspects
1
LWF - Agriculture - methods
1
UAA - Environment - reference books
1
UAM - Environmental models
1
UCEA - Environmental impact
1
UCN - Environmental education
1
UENK - Cost factors of waste management
1
UHK - Traffic and environment - incl. automobile exhaust gas
1
UKA - Environmental damage and energy production
1
UKB - Environmental effects and energy
1
UPK - Water resources, water supply
1
YAE - Law, economy, social affairs - general
1
more ...