Classification
YPB - Economy - general aspects
33
EWA - Energy economy
30
YBB - Law - general
27
UEN - Environmental economy
21
EXA - Energy policy
20
YZA - Politics, political science
18
EPK - Nuclear energy
17
UED - Environmental policy
14
EVA - Energy demand, energy supply - comprehensive works
10
UA - Environment - general
10
HCI - Radiation biology, dosimetry
9
ACE - Germanic languages, Indo-Germanic languages
8
HYH - Traumatology, emergency medicine, disasters
8
TIG - Reliability, safety, quality control
8
TNL - Nuclear fuel, nuclear fuel elements - general
8
AHF - Research and science
7
TNT - Management of nuclear materials
7
UCA - Environmental problems, man and environment - general aspects
7
UMV - Climatic change
7
YRC - Technology and society
7
GDA - Engineering geology - general
6
UHC - Area planning and environment
6
YPO - Economic policy
6
ACH - Romance languages
5
AHP - Philosophy
5
GTA - Hydrology - general
5
TAA - Engineering sciences - reference books
5
TKB - Civil engineering - buildings
5
TNJB - Nuclear reactor materials
5
TNW - Nuclear controversy
5
UEF - Sustainability
5
UKA - Environmental damage and energy production
5
YPM - National economy
5
ACA - Languages, dictionaries - general
4
CWE - Chemical engineering, chemical industry - general
4
EHA - Renewable energy sources
4
ETC - Energy conversion
4
EUA - Energy conservation - general
4
EUD - Energy consumption
4
GRB - Climatology
4
TNB - Nuclear power plants
4
UAM - Environmental models
4
UCEB - Environmental pollution
4
UEA - Environmental policy and economy - general aspects
4
UHK - Traffic and environment - incl. automobile exhaust gas
4
UMN - Air pollution control and measurement
4
UPK - Water resources, water supply
4
UXV - Radioactive waste disposal - interim and final
4
YRA - Social studies
4
YUC - Comprehensive statistical data
4
more ...