Classification
530 - Physics
511
539 - Modern physics
43
541 - Physical chemistry
28
515 - Analysis
25
519 - Probabilities & applied mathematics
24
621 - Applied physics
24
501 - Philosophy & theory
23
512 - Algebra
17
500 - Natural sciences & mathematics
13
620 - Engineering & allied operations
12
536 - Heat
9
516 - Geometry
7
004 - Data processing & computer science
6
523 - Specific celestial bodies & phenomena
6
531 - Classical mechanics; solid mechanics
6
510 - Mathematics
5
514 - Topology
5
006 - Special computer methods
4
520 - Astronomy & allied sciences
4
537 - Electricity & electronics
4
153 - Mental processes & intelligence
3
511 - General principles of mathematics
3
005 - Computer programming, programs & data
2
040 - [Unassigned]
2
120 - Epistemology, causation & humankind
2
150 - Psychology
2
160 - Logic
2
170 - Ethics
2
534 - Sound & related vibrations
2
572 - Biochemistry
2
612 - Human physiology
2
629 - Other branches of engineering
2
001 - Knowledge
1
062 - Organizations in British Isles; in England
1
110 - Metaphysics
1
300 - Social sciences
1
306 - Culture & institutions
1
333 - Economics of land & energy
1
370 - Education
1
518 - Numerical analysis
1
538 - Magnetism
1
546 - Inorganic chemistry
1
550 - Earth sciences
1
571 - Physiology & related subjects
1
808 - Rhetoric & collections of literature
1
900 - History & geography
1