Classification
530 - Physics
610
539 - Modern physics
68
620 - Engineering & allied operations
52
515 - Analysis
32
501 - Philosophy & theory
31
621 - Applied physics
26
541 - Physical chemistry
23
535 - Light & infrared & ultraviolet phenomena
20
006 - Special computer methods
19
512 - Algebra
19
500 - Natural sciences & mathematics
15
004 - Data processing & computer science
14
005 - Computer programming, programs & data
11
519 - Probabilities & applied mathematics
11
003 - Systems
10
514 - Topology
8
523 - Specific celestial bodies & phenomena
8
510 - Mathematics
7
516 - Geometry
7
520 - Astronomy & allied sciences
7
537 - Electricity & electronics
7
538 - Magnetism
6
571 - Physiology & related subjects
6
509 - Historical, geographic & persons treatment
5
531 - Classical mechanics; solid mechanics
5
536 - Heat
5
518 - Numerical analysis
4
142 - Critical philosophy
3
100 - Philosophy & psychology
2
128 - Humankind
2
153 - Mental processes & intelligence
2
330 - Economics
2
370 - Education
2
511 - General principles of mathematics
2
540 - Chemistry & allied sciences
2
542 - Techniques, equipment & materials
2
543 - Analytical chemistry
2
572 - Biochemistry
2
001 - Knowledge
1
111 - Ontology
1
113 - Cosmology
1
120 - Epistemology, causation & humankind
1
160 - Logic
1
190 - Modern western philosophy
1
300 - Social sciences
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
507 - Education, research & related topics
1
546 - Inorganic chemistry
1
more ...