Classification
ACA - Languages, dictionaries - general
2
AFG - Large scale research institutions (Helmholtz Centres)
2
AJA - Directories - general
2
YDE - Financial law, budgetary law
2
ACE - Germanic languages, Indo-Germanic languages
1
AHF - Research and science
1
AMA - Education - general
1
AZZ - Firm index - general
1
EHA - Renewable energy sources
1
EIE - Solar equipment
1
EIM - Solar architecture
1
EIP - Photovoltaics
1
EUC - Energy conservation - civil engineering
1
EXA - Energy policy
1
TAT - Engineering Standards
1
TEA - Electrical engineering - general
1
THA - Mechanical engineering - general
1
TIA - Industrial engineering - general
1
TIE - Process engineering
1
UCA - Environmental problems, man and environment - general aspects
1
UCE - Environmental impact, environmental pollution
1
UHCD - Parks and recreation areas
1
YBB - Law - general
1
YDX - Contract law
1
YPB - Economy - general aspects
1
YPGE - Human resource planning, human resource management
1
YPJ - Accounting
1