Classification
YPB - Economy - general aspects
30
THP - Pressure vessels, boilers, pipes
28
YDX - Contract law
25
YPG - Business management
18
YBB - Law - general
17
YEF - Law on hazardous materials
14
ACE - Germanic languages, Indo-Germanic languages
11
TAA - Engineering sciences - reference books
10
UVC - Environmental chemicals, hazardous materials - general aspects
10
DAE - Information technology - general
9
DWI - Information management
8
YDS - Building law
8
YPA - Economy - encyclopaedic glossaries
8
AMA - Education - general
7
ACA - Languages, dictionaries - general
6
FAAD - Metallic materials - reference books
6
YPD - Business economics
6
FMPJ - Steels and ferrous alloys for specific applications
5
THA - Mechanical engineering - general
5
THD - Design and construction in mechanical engineering
5
YDM - Commercial law, commercial legislation
5
AJA - Directories - general
4
ACH - Romance languages
3
DWA - Database systems
3
YAD - Law, economy, social affairs - comprehensive works
3
YDB - Police law, traffic law
3
YFA - Labour legislation
3
AZZ - Firm index - general
2
CAU - Laboratory and safety engineering in chemistry
2
DOM - Programming language - PASCAL, Turbo PASCAL, Delphi
2
DPA - Electronic data processing - applications
2
FMP - Ferrous materials, steel
2
FNJ - Plastics - general aspects
2
TBA - Electronic engineering - general
2
TCA - Communication science - general
2
TIG - Reliability, safety, quality control
2
UCE - Environmental impact, environmental pollution
2
UCQ - Environmental technology
2
UXP - Radioactive materials - transport, safety
2
YAB - Law, economy, social affairs - dictionaries
2
YFD - Public service legislation
2
YPGD - Quality management
2
YPO - Economic policy
2
YPW - Economy of industry branches
2
ACZ - Lists of abbreviations
1
AHL - Presentations, lectures, discussions
1
AHZ - History of science and technology
1
DKAT - Computer utilities
1
DMC - Computer programs
1
DSA - Computer graphics, image/photo editing
1
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