Classification
LCK - Ecology - general aspects
19
UHP - Protection of nature and landscape
5
UCA - Environmental problems, man and environment - general aspects
4
UHN - Landscape ecology
4
UCE - Environmental impact, environmental pollution
2
UED - Environmental policy
2
UHC - Area planning and environment
2
AFK - Research institutions - Germany
1
AHPC - Ethics
1
HYE - Environmental health
1
UCJ - Environmental protection - general aspects
1
UEA - Environmental policy and economy - general aspects
1
UHK - Traffic and environment - incl. automobile exhaust gas
1
USGT - Waste prevention
1