Classification
YPM - National economy
37
YPB - Economy - general aspects
33
YPO - Economic policy
32
YZA - Politics, political science
22
UMV - Climatic change
12
UEN - Environmental economy
10
UEA - Environmental policy and economy - general aspects
9
UED - Environmental policy
8
YPQ - National income accounting
6
AED - Official corporations - international and supranational
5
YPS - Economy of the developing countries
4
YRA - Social studies
4
UKA - Environmental damage and energy production
3
TCC - IT - Information and telecommunication
2
YDM - Commercial law, commercial legislation
2
YRB - Social sciences, sociology
2
YRC - Technology and society
2
YRCD - Informatics, information and society
2
AHA - Research and development, research politics - general
1
AHC - Research and development, research politics - Germany
1
AHPC - Ethics
1
AXA - Geographic surveys - specific countries
1
EIA - Solar energy - general
1
EIS - Solar cells
1
EXA - Energy policy
1
GRBN - Climatological models
1
GWA - Raw material economy, raw material policy
1
LCN - Ecology - soil sciences
1
LWV - Agriculture - plant protection
1
UAA - Environment - reference books
1
UCA - Environmental problems, man and environment - general aspects
1
UCJ - Environmental protection - general aspects
1
UCN - Environmental education
1
UCQ - Environmental technology
1
UEF - Sustainability
1
UEND - Environmental costs, environmental investments
1
UKE - Environment and energy resources
1
UMK - Air pollution - general aspects
1
USDN - Hazardous waste - incl. waste oil
1
USG - Waste treatment, waste disposal
1
USGT - Waste prevention
1
USU - Waste recycling
1
YDE - Financial law, budgetary law
1
YHA - Industrial property law, licensing rights
1
YMA - International law
1
YPG - Business management
1
YPW - Economy of industry branches
1