Classification
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388 - Transportation; ground transportation
3
389 - Metrology & standardization
1
400 - Language
16
410 - Linguistics
5
414 - Phonology & phonetics
98
418 - Standard usage & applied linguistics
2
500 - Natural sciences & mathematics
249
501 - Philosophy & theory
6
502 - Miscellany
1
507 - Education, research & related topics
1
509 - Historical, geographic & persons treatment
7
510 - Mathematics
86
511 - General principles of mathematics
10
512 - Algebra
9
514 - Topology
7
515 - Analysis
230
516 - Geometry
19
518 - Numerical analysis
75
519 - Probabilities & applied mathematics
173
520 - Astronomy & allied sciences
68
521 - Celestial mechanics
3
523 - Specific celestial bodies & phenomena
25
526 - Mathematical geography
7
530 - Physics
765
531 - Classical mechanics; solid mechanics
1,037
532 - Fluid mechanics; liquid mechanics
31
533 - Gas mechanics
7
534 - Sound & related vibrations
45
535 - Light & infrared & ultraviolet phenomena
36
536 - Heat
73
537 - Electricity & electronics
18
538 - Magnetism
1
539 - Modern physics
25
540 - Chemistry & allied sciences
177
541 - Physical chemistry
90
542 - Techniques, equipment & materials
3
543 - Analytical chemistry
8
546 - Inorganic chemistry
17
547 - Organic chemistry
58
548 - Crystallography
4
549 - Mineralogy
5
550 - Earth sciences
31
551 - Geology, hydrology & meteorology
100
553 - Economic geology
1
560 - Paleontology; paleozoology
1
570 - Life sciences; biology
20
571 - Physiology & related subjects
29
572 - Biochemistry
9
573 - Specific physiological systems in animals
1
574 - [Unassigned]
17
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