Classification
YDX - Contract law
42
YPB - Economy - general aspects
40
THP - Pressure vessels, boilers, pipes
28
YEF - Law on hazardous materials
24
YPG - Business management
22
UVC - Environmental chemicals, hazardous materials - general aspects
20
AMA - Education - general
17
YBB - Law - general
17
YDS - Building law
17
ACE - Germanic languages, Indo-Germanic languages
13
LVE - Food science - general
12
YCA - Public law
12
DAE - Information technology - general
10
TAA - Engineering sciences - reference books
10
DWI - Information management
9
YDM - Commercial law, commercial legislation
8
YPA - Economy - encyclopaedic glossaries
8
YPD - Business economics
7
ACA - Languages, dictionaries - general
6
FAAD - Metallic materials - reference books
6
FMPJ - Steels and ferrous alloys for specific applications
5
THA - Mechanical engineering - general
5
THD - Design and construction in mechanical engineering
5
YDP - Foreign trade law, foreign currency law
5
AJA - Directories - general
4
YFA - Labour legislation
4
YFD - Public service legislation
4
ACH - Romance languages
3
DMC - Computer programs
3
DWA - Database systems
3
TIG - Reliability, safety, quality control
3
YAD - Law, economy, social affairs - comprehensive works
3
YDB - Police law, traffic law
3
YPGH - Planning and controlling
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
UCE - Environmental impact, environmental pollution
2
UCQ - Environmental technology
2
UXP - Radioactive materials - transport, safety
2
YAB - Law, economy, social affairs - dictionaries
2
YDMB - Trade law
2
YPGD - Quality management
2
YPGE - Human resource planning, human resource management
2
YPO - Economic policy
2
more ...