Classification
UAX - Environment - information systems, literature guides
51
UAN - Environment - mathematical methods, computer applications
6
UAD - Environment - comprehensive works
5
UMV - Climatic change
5
UAM - Environmental models
4
UMN - Air pollution control and measurement
3
AQBN - Reference guides - environment, ecology
2
UAA - Environment - reference books
2
UEG - Environmental programs and expertises
2
UVFD - Environmental aspects of specific heavy metals - cadmium, lead, mercury
2
AES - Universities, academies - Germany
1
AFA - Research institutions, scientific organizations - international and supranational
1
AZZ - Firm index - general
1
HDG - Psychology, psychiatry
1
LCO - Hydrobiology
1
LCV - Ecology - models
1
LWE - Agriculture - general aspects
1
TKB - Civil engineering - buildings
1
UCE - Environmental impact, environmental pollution
1
UCL - Environmental research
1
UCN - Environmental education
1
UPN - Water protection, water quality, clean water
1
UVR - Environmental aspects of halogens and halogenated hydrocarbons
1
YPB - Economy - general aspects
1