Classification
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DUA - Text and document processing
5
DWI - Information management
5
EIP - Photovoltaics
5
ETA - Energy storage
5
EUA - Energy conservation - general
5
GVA - Oceanography
5
HAA - Medicine - reference books
5
HDG - Psychology, psychiatry
5
LMA - Biophysics - reference books
5
LMN - Molecular biophysics, biophysical chemistry
5
LTX - Bioeconomy
5
TKJ - Traffic
5
UKA - Environmental damage and energy production
5
YDS - Building law
5
YMG - Law of international and supranational organizations
5
YPC - Public administration
5
YZA - Politics, political science
5
ABD - National biographic catalogues - Germany
4
AHK - Scientific work
4
AHL - Presentations, lectures, discussions
4
DKAE - Windows
4
DNC - Internet
4
DTAH - MS Exchange, Outlook
4
FAP - Advanced materials - development and applications
4
FGK - Thin film technology, epitaxy
4
HAE - Popular medicine
4
HPD - Pharmacology - comprehensive works
4
LWE - Agriculture - general aspects
4
PAD - Physics - comprehensive works
4
THA - Mechanical engineering - general
4
THQ - Fluid mechanics and dynamics
4
TIG - Reliability, safety, quality control
4
UCA - Environmental problems, man and environment - general aspects
4
UED - Environmental policy
4
UHP - Protection of nature and landscape
4
YDG - Tax legislation
4
YPGK - Marketing
4
YPGL - Public relations
4
YPJ - Accounting
4
YPO - Economic policy
4
AFK - Research institutions - Germany
3
AHH - Universities - research
3
AHQ - Art and exhibitions
3
DAE - Information technology - general
3
DOE - Programming language - BASIC, Turbo BASIC, Visual BASIC
3
DWAC - Relational database systems
3
DZE - Data privacy, data security
3
EFA - Petroleum, natural gas
3
EGA - Oil shale, oil sands
3
EVB - Energy supply of Germany
3
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