Classification
530 - Physics
1,216
539 - Modern physics
121
620 - Engineering & allied operations
69
515 - Analysis
60
621 - Applied physics
55
501 - Philosophy & theory
52
541 - Physical chemistry
51
512 - Algebra
38
519 - Probabilities & applied mathematics
36
500 - Natural sciences & mathematics
34
333 - Economics of land & energy
33
700 - The arts; fine & decorative arts
31
006 - Special computer methods
26
004 - Data processing & computer science
24
535 - Light & infrared & ultraviolet phenomena
22
510 - Mathematics
19
516 - Geometry
15
520 - Astronomy & allied sciences
14
523 - Specific celestial bodies & phenomena
14
531 - Classical mechanics; solid mechanics
14
536 - Heat
14
005 - Computer programming, programs & data
13
514 - Topology
13
537 - Electricity & electronics
12
003 - Systems
11
000 - Computer science, information & general works
10
538 - Magnetism
7
571 - Physiology & related subjects
7
153 - Mental processes & intelligence
6
511 - General principles of mathematics
6
658 - General management
6
100 - Philosophy & psychology
5
300 - Social sciences
5
331 - Labor economics
5
509 - Historical, geographic & persons treatment
5
518 - Numerical analysis
5
120 - Epistemology, causation & humankind
4
330 - Economics
4
572 - Biochemistry
4
600 - Technology
4
900 - History & geography
4
142 - Critical philosophy
3
160 - Logic
3
550 - Earth sciences
3
610 - Medicine & health
3
612 - Human physiology
3
629 - Other branches of engineering
3
001 - Knowledge
2
128 - Humankind
2
150 - Psychology
2
more ...