Classification
THH - Machines
25
UPN - Water protection, water quality, clean water
14
TIG - Reliability, safety, quality control
11
FPHG - Mechanical testing
10
TCLM - Magnetic recording, memory cards
7
THD - Design and construction in mechanical engineering
6
LHH - Microbiology - methods
5
CTDP - Reagents and reference materials in analytical chemistry
4
DHA - Computer equipment and periphery
4
DNA - Computer networks, local area networks
4
FNT - Powder technology
4
HRD - Dosimetry, radiation protection - medical aspects
4
HWS - Surgery, anaesthesy
4
THA - Mechanical engineering - general
4
THP - Pressure vessels, boilers, pipes
4
FMPJ - Steels and ferrous alloys for specific applications
3
FPGD - Creep
3
FPN - Nondestructive testing
3
FPNJ - Radiographic testing
3
HBA - Medical physics
3
HCE - Biomedical engineering - general aspects
3
TCA - Communication science - general
3
THHB - Machine tools
3
TIH - Ergonomics, man machine systems
3
TNA - Nuclear engineering - general
3
UXL - Radiation protection - general aspects
3
AQAG - Reference guides to patents and standards
2
CWOC - Characterization and size measurement of particles
2
EIE - Solar equipment
2
FAH - Materials research - general aspects
2
FNPH - Ceramics for specific applications
2
FPH - Fatigue, mechanical testing
2
FPK - Fracture mechanics, strength
2
FPM - Materials testing - general aspects
2
PAA - Physics - reference books
2
TAT - Engineering Standards
2
TGBG - Mechanical and physical measurement
2
THHD - Machine parts
2
THK - Joining - welding, brazing, soldering
2
TNQ - Nuclear reactor operation, control, measurement
2
TNT - Management of nuclear materials
2
UEA - Environmental policy and economy - general aspects
2
UED - Environmental policy
2
UXP - Radioactive materials - transport, safety
2
UXV - Radioactive waste disposal - interim and final
2
ZBHC - Electronic publishing
2
ACE - Germanic languages, Indo-Germanic languages
1
ACQ - Oriental languages
1
AQPH - Lists of standards
1
AXM - Guidebooks - Cities
1
more ...