Classification
YRA - Social studies
9
HDG - Psychology, psychiatry
7
PAE - Physics - general interest
4
AHZ - History of science and technology
3
ACA - Languages, dictionaries - general
2
HDF - Brain - anatomy, function, disorders
2
HDS - Neurophysiology, neuroanatomy
2
TNW - Nuclear controversy
2
AAE - Popular science - general aspects
1
AHA - Research and development, research politics - general
1
AHE - Research and development, research politics - foreign countries
1
AHK - Scientific work
1
AHL - Presentations, lectures, discussions
1
AHN - Media and communication science
1
AHQ - Art and exhibitions
1
CXUX - Natural products
1
DYAA - Learning theory, adaptive systems
1
DZC - Man and computer
1
DZE - Data privacy, data security
1
EAA - Energy - reference books
1
EBA - Energy production, energy technology
1
EHA - Renewable energy sources
1
EIA - Solar energy - general
1
ETA - Energy storage
1
EVN - Energy supply - future aspects
1
FAHH - Materials research - historical aspects
1
HAM - Medicine - theoretical and philosophical fundamentals
1
HCI - Radiation biology, dosimetry
1
LAA - Biology - reference books
1
LCT - Radioecology
1
LGT - Neurobiology, neurophysiology
1
LON - Molecular genetics
1
LTA - Biotechnology - reference books
1
LTH - Biotechnology - methods
1
LWE - Agriculture - general aspects
1
MAE - Mathematics - general interest
1
MWH - Statistics
1
PAM - Physics - miscellaneous topics
1
PKG - Accelerators
1
TKJ - Traffic
1
UAD - Environment - comprehensive works
1
UCE - Environmental impact, environmental pollution
1
UCJ - Environmental protection - general aspects
1
UCN - Environmental education
1
UED - Environmental policy
1
UEND - Environmental costs, environmental investments
1
UKE - Environment and energy resources
1
UKL - Environment and nuclear power
1
YPG - Business management
1
YRAB - Gender studies
1
more ...