Classification
YPB - Economy - general aspects
3
YPM - National economy
3
ABM - Special subject biographies
2
GTA - Hydrology - general
2
YBB - Law - general
2
YZA - Politics, political science
2
ACE - Germanic languages, Indo-Germanic languages
1
AHK - Scientific work
1
CAA - Chemistry - reference books
1
DMAF - Object oriented programming
1
DOE - Programming language - BASIC, Turbo BASIC, Visual BASIC
1
DOFC - Programming language - C plus-plus
1
EWA - Energy economy
1
EXA - Energy policy
1
FAA - Materials research - reference books
1
GTAP - Hydrological investigation methods
1
GWA - Raw material economy, raw material policy
1
GWBA - Raw material resources, raw material reserves
1
MAD - Mathematics - comprehensive works
1
MWAA - Elementary probability theory
1
MWHB - Statistical distributions, mean values, moments
1
MWHC - Regression theory, correlation theory
1
MWHE - Quality examination, sampling theory, maximum likelihood estimation
1
PAA - Physics - reference books
1
TCN - Microprocessors
1
TKA - Civil engineering - general
1
TKB - Civil engineering - buildings
1
UCQ - Environmental technology
1
UEN - Environmental economy
1
UKA - Environmental damage and energy production
1
UKH - Environment and power plants, industrial plants
1
UPC - Water - general aspects
1
UPN - Water protection, water quality, clean water
1
UVC - Environmental chemicals, hazardous materials - general aspects
1
YPW - Economy of industry branches
1