Classification
LCK - Ecology - general aspects
2
UCA - Environmental problems, man and environment - general aspects
2
AZZ - Firm index - general
1
EKA - Wind energy
1
EVA - Energy demand, energy supply - comprehensive works
1
GPA - Geobiology - general
1
LCO - Hydrobiology
1
UHK - Traffic and environment - incl. automobile exhaust gas
1
UHP - Protection of nature and landscape
1
YEA - Environmental law
1
YMA - International law
1
YUD - Comprehensive statistical data - Germany
1