Classification
TKB - Civil engineering - buildings
11
USN - Waste water treatment
11
TEA - Electrical engineering - general
7
TKD - Air conditioning, refrigeration
5
DSA - Computer graphics, image/photo editing
4
TKA - Civil engineering - general
4
YPG - Business management
4
ASEA - Book production, printing, paper, script
3
DTAF - MS - Excel
3
DWID - Multimedia, hypertext
3
UAU - Fire, fire protection, safety at the workplace, prevention of accidents
3
CAU - Laboratory and safety engineering in chemistry
2
DMC - Computer programs
2
DYK - Image processing
2
TBA - Electronic engineering - general
2
THA - Mechanical engineering - general
2
THP - Pressure vessels, boilers, pipes
2
UA - Environment - general
2
UCQ - Environmental technology
2
USNH - Waste water treatment - special methods
2
USR - Slurry, sludge - treatment and use
2
YPD - Business economics
2
AHK - Scientific work
1
AHN - Media and communication science
1
AMA - Education - general
1
AMAB - Industrial training, further education
1
CAA - Chemistry - reference books
1
CTOD - Activation analysis
1
CTYR - Microanalysis
1
CWB - Chemical engineering - comprehensive works
1
CWE - Chemical engineering, chemical industry - general
1
DAE - Information technology - general
1
DKAE - Windows
1
DKAT - Computer utilities
1
DMA - Programming
1
DOE - Programming language - BASIC, Turbo BASIC, Visual BASIC
1
DOZ - Programming languages - Other
1
DTAE - MS - Access
1
DUA - Text and document processing
1
EUA - Energy conservation - general
1
FPU - Corrosion protection, surface coating
1
HYH - Traumatology, emergency medicine, disasters
1
LAQ - Laboratory and safety engineering in biology
1
LVE - Food science - general
1
MFB - Linear algebra
1
MIAB - Infinitesimal calculus, foundations and textbooks
1
PAD - Physics - comprehensive works
1
TAA - Engineering sciences - reference books
1
TEDF - Electric power application
1
TGN - Control engineering
1
more ...