Classification
621 - Applied physics
421
670 - Manufacturing
321
620 - Engineering & allied operations
206
004 - Data processing & computer science
144
006 - Special computer methods
129
005 - Computer programming, programs & data
56
003 - Systems
50
629 - Other branches of engineering
39
658 - General management
37
690 - Buildings
26
519 - Probabilities & applied mathematics
17
518 - Numerical analysis
16
624 - Civil engineering
16
515 - Analysis
11
610 - Medicine & health
6
660 - Chemical engineering
6
025 - Library operations
5
516 - Geometry
5
530 - Physics
5
330 - Economics
4
531 - Classical mechanics; solid mechanics
4
720 - Architecture
4
333 - Economics of land & energy
3
346 - Private law
3
910 - Geography & travel
3
300 - Social sciences
2
371 - Schools & their activities; special education
2
511 - General principles of mathematics
2
520 - Astronomy & allied sciences
2
650 - Management & auxiliary services
2
696 - Utilities
2
000 - Computer science, information & general works
1
001 - Knowledge
1
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
327 - International relations
1
500 - Natural sciences & mathematics
1
501 - Philosophy & theory
1
510 - Mathematics
1
512 - Algebra
1
537 - Electricity & electronics
1
539 - Modern physics
1
542 - Techniques, equipment & materials
1
550 - Earth sciences
1
614 - Incidence & prevention of disease
1
616 - Diseases
1
618 - Gynecology, obstetrics, pediatrics & geriatrics
1
628 - Sanitary & municipal engineering
1
630 - Agriculture & related technologies
1
more ...