Classification
EXA - Energy policy
ETC - Energy conversion
30
YPB - Economy - general aspects
28
EVN - Energy supply - future aspects
26
EWA - Energy economy
18
EVA - Energy demand, energy supply - comprehensive works
17
EHA - Renewable energy sources
14
UA - Environment - general
13
UED - Environmental policy
12
EPK - Nuclear energy
11
EAD - Energy - comprehensive works
10
YZA - Politics, political science
10
EVB - Energy supply of Germany
8
EYA - Energy problems of developing countries
8
EAA - Energy - reference books
7
UKA - Environmental damage and energy production
7
ECA - Energy resources
6
EVP - Energy models, energy system analysis
6
GWA - Raw material economy, raw material policy
5
UEF - Sustainability
5
EGA - Oil shale, oil sands
4
EUA - Energy conservation - general
4
EUD - Energy consumption
4
CWE - Chemical engineering, chemical industry - general
3
TED - Electric power - industrial aspect
3
UCEA - Environmental impact
3
UKB - Environmental effects and energy
3
UKE - Environment and energy resources
3
UKL - Environment and nuclear power
3
YBB - Law - general
3
YEN - Atomic energy law
3
AJA - Directories - general
2
EBA - Energy production, energy technology
2
ETF - Fuel cells - general
2
EVH - Energy supply - economic growth
2
MSU - Economic analysis
2
TIG - Reliability, safety, quality control
2
TNA - Nuclear engineering - general
2
UKH - Environment and power plants, industrial plants
2
UMV - Climatic change
2
YRA - Social studies
2
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
AHP - Philosophy
1
EAE - Energy - general
1
EFA - Petroleum, natural gas
1
ENA - Energy from biomass and waste
1
ESB - Hydrogen energy
1
ETA - Energy storage
1
more ...