Classification
530 - Physics
1,548
515 - Analysis
330
620 - Engineering & allied operations
264
519 - Probabilities & applied mathematics
203
621 - Applied physics
168
539 - Modern physics
155
518 - Numerical analysis
115
536 - Heat
101
531 - Classical mechanics; solid mechanics
99
003 - Systems
85
006 - Special computer methods
68
512 - Algebra
67
516 - Geometry
66
523 - Specific celestial bodies & phenomena
59
520 - Astronomy & allied sciences
51
537 - Electricity & electronics
48
541 - Physical chemistry
47
629 - Other branches of engineering
46
004 - Data processing & computer science
45
510 - Mathematics
34
571 - Physiology & related subjects
34
535 - Light & infrared & ultraviolet phenomena
30
500 - Natural sciences & mathematics
24
550 - Earth sciences
24
501 - Philosophy & theory
22
514 - Topology
19
511 - General principles of mathematics
17
330 - Economics
16
005 - Computer programming, programs & data
15
551 - Geology, hydrology & meteorology
12
534 - Sound & related vibrations
9
538 - Magnetism
9
624 - Civil engineering
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
526 - Mathematical geography
5
910 - Geography & travel
5
300 - Social sciences
4
332 - Financial economics
4
001 - Knowledge
3
120 - Epistemology, causation & humankind
3
153 - Mental processes & intelligence
3
509 - Historical, geographic & persons treatment
3
576 - Genetics & evolution
3
more ...