Classification
EXA - Energy policy
EVA - Energy demand, energy supply - comprehensive works
35
ETC - Energy conversion
33
YPB - Economy - general aspects
29
EVN - Energy supply - future aspects
27
EWA - Energy economy
20
EVH - Energy supply - economic growth
19
EHA - Renewable energy sources
14
UA - Environment - general
13
UED - Environmental policy
13
EAD - Energy - comprehensive works
11
EPK - Nuclear energy
11
YZA - Politics, political science
11
EVB - Energy supply of Germany
9
EVP - Energy models, energy system analysis
9
EYA - Energy problems of developing countries
8
EAA - Energy - reference books
7
UKA - Environmental damage and energy production
7
ECA - Energy resources
6
EUD - Energy consumption
6
EUA - Energy conservation - general
5
GWA - Raw material economy, raw material policy
5
UEF - Sustainability
5
EGA - Oil shale, oil sands
4
CWE - Chemical engineering, chemical industry - general
3
TED - Electric power - industrial aspect
3
TIG - Reliability, safety, quality control
3
TNA - Nuclear engineering - general
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
ESB - Hydrogen energy
2
ETA - Energy storage
2
ETF - Fuel cells - general
2
MSU - Economic analysis
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
more ...