Classification
TEA - Electrical engineering - general
106
THA - Mechanical engineering - general
96
AMA - Education - general
64
THD - Design and construction in mechanical engineering
53
TAA - Engineering sciences - reference books
34
TBA - Electronic engineering - general
31
TIE - Process engineering
28
YPH - Secretarial work, office management
27
CBB - Inorganic chemistry - comprehensive works
22
PAD - Physics - comprehensive works
21
THJ - Machining
20
TBC - Electronic circuits
19
THE - Computer aided design and engineering (CAD)
19
AMAB - Industrial training, further education
18
YPGE - Human resource planning, human resource management
16
CAN - Chemistry - mathematical methods, computer applications
15
CAE - Chemistry - general
14
CAU - Laboratory and safety engineering in chemistry
14
CEC - Organic chemistry - comprehensive works
14
TEDF - Electric power application
14
ACE - Germanic languages, Indo-Germanic languages
13
TBJ - Integrated circuits
13
TGN - Control engineering
13
TCQ - Process control computers, multiprocessors
12
TGNE - Control engineering - applications
12
YPD - Business economics
12
TBS - Digital electronics
11
YPJ - Accounting
11
TBG - Transistors
10
TBH - Power electronics, rectifiers, thyristors
10
THJB - Mechanical working
9
CTA - Chemical analysis - comprehensive works
8
CTD - Chemical analysis - general aspects
8
FPM - Materials testing - general aspects
8
TGBE - Electric and electronic measurement
8
CHA - Physical chemistry - comprehensive works
7
DGE - Personal computers
7
FNK - Plastics - application, engineering aspects
7
MAD - Mathematics - comprehensive works
7
PAE - Physics - general interest
7
TEF - Electric machines, electric cables
7
THH - Machines
7
THHD - Machine parts
7
TKD - Air conditioning, refrigeration
7
YFA - Labour legislation
7
YKP - German civil law
7
YPG - Business management
7
AMAB - industrial training, further education
6
CAA - Chemistry - reference books
6
CEF - Organic chemistry - introductions
6
more ...