Classification
EXA - Energy policy
5
YPB - Economy - general aspects
4
EWA - Energy economy
2
YZA - Politics, political science
2
AFA - Research institutions, scientific organizations - international and supranational
1
AHZ - History of science and technology
1
DGA - Computer types, plants and organization
1
DWA - Database systems
1
ECA - Energy resources
1
EFA - Petroleum, natural gas
1
EGA - Oil shale, oil sands
1
EPK - Nuclear energy
1
EUD - Energy consumption
1
EYA - Energy problems of developing countries
1
FAN - Solid state physics - mathematical methods, computer applications
1
FJCK - Electrical conduction in solid materials
1
GMAD - Organic geochemistry
1
GWA - Raw material economy, raw material policy
1
GWB - Raw materials - metals, nonmetals
1
H - Medicine ( journals )
1
HAA - Medicine - reference books
1
HAM - Medicine - theoretical and philosophical fundamentals
1
HCI - Radiation biology, dosimetry
1
HEF - Human physiology - reproduction and development
1
HPT - Toxicology
1
HTJ - Tumors
1
HTW - Oncology - therapeutics
1
LAL - Biology - general aspects
1
LGN - Zoology - anatomy, systematics, embryology
1
LKA - Biochemistry - reference books
1
LKRA - Biochemistry of enzymes - methods
1
M - Mathematics ( journals )
1
MFE - Algebras
1
MNB - Numerical algebra
1
MNLA - Computational methods in mathematics
1
MSD - Mathematical methods in physics
1
MWF - Programming, optimization, control theory
1
MWHI - Error analysis, balancing calculations, least squares methods
1
MWHL - Modeling, classification, clustering
1
PKA - Elementary particles, nuclei - general
1
PKK - Theory of fields and particles - general
1
TCB - Communication and information - theory
1
TCN - Microprocessors
1
TED - Electric power - industrial aspect
1
TNA - Nuclear engineering - general
1
TNG - Breeder reactors
1
UEN - Environmental economy
1
UKA - Environmental damage and energy production
1
UXPN - Nonproliferation, nuclear weapons
1
YAE - Law, economy, social affairs - general
1
more ...