Classification
AZZ - Firm index - general
105
LTA - Biotechnology - reference books
18
EVA - Energy demand, energy supply - comprehensive works
16
AJA - Directories - general
5
EAA - Energy - reference books
5
EKA - Wind energy
5
GWA - Raw material economy, raw material policy
4
CWE - Chemical engineering, chemical industry - general
3
DNC - Internet
3
EWA - Energy economy
2
FGK - Thin film technology, epitaxy
2
FGM - Microelectronic technology
2
FPUJ - Surface engineering
2
UAA - Environment - reference books
2
AES - Universities, academies - Germany
1
AFC - Research institutions, scientific organizations - Germany ( DFG, MPG, FHG )
1
AFM - Research institutions - Europe
1
AHC - Research and development, research politics - Germany
1
EHA - Renewable energy sources
1
EIA - Solar energy - general
1
FAQ - Materials research - institutions, research and development
1
FLC - Superconductivity - general aspects
1
HAA - Medicine - reference books
1
LMR - Biophysics - transport phenomena
1
TBA - Electronic engineering - general
1
TEA - Electrical engineering - general
1
TNLC - Nuclear fuel cycle
1
UAX - Environment - information systems, literature guides
1
UHP - Protection of nature and landscape
1