Classification
EXA - Energy policy
UED - Environmental policy
AHA - Research and development, research politics - general
1
AHC - Research and development, research politics - Germany
1
AHE - Research and development, research politics - foreign countries
1
GRB - Climatology
1
UMN - Air pollution control and measurement
1
UMV - Climatic change
1
YPO - Economic policy
1
YZA - Politics, political science
1