Classification
001 - Knowledge
3
003 - Systems
85
004 - Data processing & computer science
45
005 - Computer programming, programs & data
15
006 - Special computer methods
68
107 - Education, research & related topics
1
120 - Epistemology, causation & humankind
3
150 - Psychology
1
153 - Mental processes & intelligence
3
160 - Logic
1
300 - Social sciences
4
301 - Sociology & anthropology
2
307 - Communities
1
330 - Economics
16
332 - Financial economics
4
333 - Economics of land & energy
6
338 - Production
2
363 - Other social problems & services
2
410 - Linguistics
1
418 - Standard usage & applied linguistics
1
500 - Natural sciences & mathematics
24
501 - Philosophy & theory
22
507 - Education, research & related topics
1
509 - Historical, geographic & persons treatment
3
510 - Mathematics
34
511 - General principles of mathematics
17
512 - Algebra
67
514 - Topology
19
515 - Analysis
330
516 - Geometry
66
518 - Numerical analysis
115
519 - Probabilities & applied mathematics
203
520 - Astronomy & allied sciences
51
523 - Specific celestial bodies & phenomena
59
526 - Mathematical geography
5
530 - Physics
1,548
531 - Classical mechanics; solid mechanics
99
532 - Fluid mechanics; liquid mechanics
2
533 - Gas mechanics
2
534 - Sound & related vibrations
9
535 - Light & infrared & ultraviolet phenomena
30
536 - Heat
101
537 - Electricity & electronics
48
538 - Magnetism
9
539 - Modern physics
155
540 - Chemistry & allied sciences
2
541 - Physical chemistry
47
542 - Techniques, equipment & materials
1
543 - Analytical chemistry
8
546 - Inorganic chemistry
2
more ...