Classification
EWA - Energy economy
13
UA - Environment - general
5
EXA - Energy policy
4
ACE - Germanic languages, Indo-Germanic languages
2
EVA - Energy demand, energy supply - comprehensive works
2
GFA - Mineralogy - general
2
TAA - Engineering sciences - reference books
2
UCA - Environmental problems, man and environment - general aspects
2
UKE - Environment and energy resources
2
YBB - Law - general
2
AQAF - Reference guides to government publications
1
CAA - Chemistry - reference books
1
CAU - Laboratory and safety engineering in chemistry
1
CHRD - Gases and their properties
1
CLE - Combustion, flames, explosions
1
CWE - Chemical engineering, chemical industry - general
1
DOZ - Programming languages - Other
1
EBA - Energy production, energy technology
1
GWA - Raw material economy, raw material policy
1
MWAA - Elementary probability theory
1
MWHB - Statistical distributions, mean values, moments
1
MWHC - Regression theory, correlation theory
1
MWHE - Quality examination, sampling theory, maximum likelihood estimation
1
TCN - Microprocessors
1
TIA - Industrial engineering - general
1
TKJ - Traffic
1
TNB - Nuclear power plants
1
TNJ - Nuclear reactor technology
1
UAD - Environment - comprehensive works
1
UCE - Environmental impact, environmental pollution
1
UCJ - Environmental protection - general aspects
1
UED - Environmental policy
1
UEN - Environmental economy
1
UKA - Environmental damage and energy production
1
UKH - Environment and power plants, industrial plants
1
UMV - Climatic change
1
UPK - Water resources, water supply
1
UPN - Water protection, water quality, clean water
1
UPVN - Ocean water, coastal waters
1
YEN - Atomic energy law
1
YFA - Labour legislation
1
YFD - Public service legislation
1
YPB - Economy - general aspects
1
YPW - Economy of industry branches
1
YRA - Social studies
1
YRB - Social sciences, sociology
1
YRC - Technology and society
1
YUD - Comprehensive statistical data - Germany
1