Classification
UCA - Environmental problems, man and environment - general aspects
6
UMV - Climatic change
6
UCN - Environmental education
2
UED - Environmental policy
2
UEN - Environmental economy
2
UMEE - Clean air planning
2
GRBA - Climatology - general
1
UAA - Environment - reference books
1
UAD - Environment - comprehensive works
1
UCE - Environmental impact, environmental pollution
1
UCJ - Environmental protection - general aspects
1
UCL - Environmental research
1
UHC - Area planning and environment
1
UKE - Environment and energy resources
1
UME - Clean air
1
YED - Law on clean air
1
YRC - Technology and society
1