Classification
TKJ - Traffic
22
YEF - Law on hazardous materials
20
UHK - Traffic and environment - incl. automobile exhaust gas
18
YDB - Police law, traffic law
11
ESB - Hydrogen energy
4
URA - Soil chemistry
3
YPM - National economy
3
ESA - Synthetic fuels - utilization
2
ETFG - Polymer electrolyte membrane fuel cells ( PEMFC )
2
EVB - Energy supply of Germany
2
EWA - Energy economy
2
UEA - Environmental policy and economy - general aspects
2
UMN - Air pollution control and measurement
2
EVN - Energy supply - future aspects
1
EVP - Energy models, energy system analysis
1
HYE - Environmental health
1
LTO - Biotechnology - application, industry
1
UCE - Environmental impact, environmental pollution
1
UEF - Sustainability
1
UHC - Area planning and environment
1
UMLN - Air pollution by other sources
1
UNA - Noise pollution
1
USU - Waste recycling
1
UVC - Environmental chemicals, hazardous materials - general aspects
1
YPB - Economy - general aspects
1