Classification
EWA - Energy economy
15
EXA - Energy policy
10
EPK - Nuclear energy
7
TNL - Nuclear fuel, nuclear fuel elements - general
7
GDA - Engineering geology - general
6
CWE - Chemical engineering, chemical industry - general
4
TNJB - Nuclear reactor materials
4
TNT - Management of nuclear materials
4
UCEB - Environmental pollution
4
UKA - Environmental damage and energy production
4
UXV - Radioactive waste disposal - interim and final
4
YBB - Law - general
4
ESB - Hydrogen energy
3
EVP - Energy models, energy system analysis
3
GTA - Hydrology - general
3
TAA - Engineering sciences - reference books
3
TNW - Nuclear controversy
3
UA - Environment - general
3
UEF - Sustainability
3
YZA - Politics, political science
3
ACE - Germanic languages, Indo-Germanic languages
2
ACH - Romance languages
2
CR - Nuclear chemistry, radiation chemistry
2
EHA - Renewable energy sources
2
ETC - Energy conversion
2
EUA - Energy conservation - general
2
EVA - Energy demand, energy supply - comprehensive works
2
TIG - Reliability, safety, quality control
2
TNOB - Nuclear reactor accidents
2
UAA - Environment - reference books
2
UED - Environmental policy
2
UMV - Climatic change
2
UPK - Water resources, water supply
2
UXW - Underground disposal of radioactive waste
2
YEN - Atomic energy law
2
YPB - Economy - general aspects
2
ACA - Languages, dictionaries - general
1
AHF - Research and science
1
CRCD - Nuclear reactions
1
CXX - Hydrogen production - chemistry and technology
1
DMAF - Object oriented programming
1
DMC - Computer programs
1
DOE - Programming language - BASIC, Turbo BASIC, Visual BASIC
1
DOFC - Programming language - C plus-plus
1
ECA - Energy resources
1
EEA - Coal - general
1
EFA - Petroleum, natural gas
1
ETA - Energy storage
1
EUD - Energy consumption
1
EVB - Energy supply of Germany
1
more ...