Classification
621 - Applied physics
1,679
006 - Special computer methods
255
004 - Data processing & computer science
172
620 - Engineering & allied operations
102
530 - Physics
90
629 - Other branches of engineering
55
003 - Systems
52
005 - Computer programming, programs & data
50
519 - Probabilities & applied mathematics
49
670 - Manufacturing
47
520 - Astronomy & allied sciences
46
515 - Analysis
42
537 - Electricity & electronics
37
534 - Sound & related vibrations
30
541 - Physical chemistry
25
300 - Social sciences
24
500 - Natural sciences & mathematics
24
001 - Knowledge
23
539 - Modern physics
23
040 - [Unassigned]
19
511 - General principles of mathematics
18
338 - Production
16
518 - Numerical analysis
13
658 - General management
13
531 - Classical mechanics; solid mechanics
12
570 - Life sciences; biology
12
535 - Light & infrared & ultraviolet phenomena
11
571 - Physiology & related subjects
11
516 - Geometry
10
660 - Chemical engineering
9
333 - Economics of land & energy
8
062 - Organizations in British Isles; in England
7
512 - Algebra
7
543 - Analytical chemistry
7
361 - Social problems & social welfare in general
5
538 - Magnetism
5
624 - Civil engineering
5
330 - Economics
4
363 - Other social problems & services
4
509 - Historical, geographic & persons treatment
4
510 - Mathematics
4
617 - Surgery & related medical specialties
4
650 - Management & auxiliary services
4
327 - International relations
3
370 - Education
3
410 - Linguistics
3
523 - Specific celestial bodies & phenomena
3
536 - Heat
3
610 - Medicine & health
3
616 - Diseases
3
more ...