Classification
530 - Physics
1,585
515 - Analysis
338
620 - Engineering & allied operations
296
519 - Probabilities & applied mathematics
199
621 - Applied physics
174
539 - Modern physics
159
518 - Numerical analysis
118
536 - Heat
102
531 - Classical mechanics; solid mechanics
98
003 - Systems
88
006 - Special computer methods
70
512 - Algebra
69
516 - Geometry
67
523 - Specific celestial bodies & phenomena
60
520 - Astronomy & allied sciences
58
537 - Electricity & electronics
48
541 - Physical chemistry
47
629 - Other branches of engineering
46
004 - Data processing & computer science
44
510 - Mathematics
35
571 - Physiology & related subjects
35
535 - Light & infrared & ultraviolet phenomena
27
500 - Natural sciences & mathematics
26
550 - Earth sciences
26
501 - Philosophy & theory
22
514 - Topology
19
005 - Computer programming, programs & data
18
330 - Economics
17
511 - General principles of mathematics
17
551 - Geology, hydrology & meteorology
12
534 - Sound & related vibrations
11
624 - Civil engineering
10
538 - Magnetism
9
670 - Manufacturing
9
543 - Analytical chemistry
8
570 - Life sciences; biology
7
612 - Human physiology
7
658 - General management
7
333 - Economics of land & energy
6
548 - Crystallography
6
610 - Medicine & health
6
910 - Geography & travel
6
300 - Social sciences
5
526 - Mathematical geography
5
332 - Financial economics
4
509 - Historical, geographic & persons treatment
4
616 - Diseases
4
001 - Knowledge
3
120 - Epistemology, causation & humankind
3
153 - Mental processes & intelligence
3
more ...