Classification
001 - Knowledge
1
003 - Systems
2
004 - Data processing & computer science
4
005 - Computer programming, programs & data
3
006 - Special computer methods
2
300 - Social sciences
1
332 - Financial economics
1
333 - Economics of land & energy
5
363 - Other social problems & services
2
500 - Natural sciences & mathematics
3
510 - Mathematics
8
511 - General principles of mathematics
12
512 - Algebra
16
514 - Topology
2
515 - Analysis
28
516 - Geometry
6
518 - Numerical analysis
7
519 - Probabilities & applied mathematics
18
520 - Astronomy & allied sciences
53
523 - Specific celestial bodies & phenomena
50
530 - Physics
39
531 - Classical mechanics; solid mechanics
2
534 - Sound & related vibrations
1
536 - Heat
2
537 - Electricity & electronics
3
538 - Magnetism
1
539 - Modern physics
14
540 - Chemistry & allied sciences
7
541 - Physical chemistry
82
542 - Techniques, equipment & materials
2
543 - Analytical chemistry
11
546 - Inorganic chemistry
10
547 - Organic chemistry
26
548 - Crystallography
3
549 - Mineralogy
8
550 - Earth sciences
13
551 - Geology, hydrology & meteorology
65
560 - Paleontology; paleozoology
1
571 - Physiology & related subjects
2
572 - Biochemistry
9
576 - Genetics & evolution
1
577 - Ecology
1
590 - Animals (Zoology)
1
620 - Engineering & allied operations
8
621 - Applied physics
13
624 - Civil engineering
2
629 - Other branches of engineering
1
631 - Techniques, equipment & materials
1
660 - Chemical engineering
1
910 - Geography & travel
1