Classification
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415 - Grammar
33
417 - Dialectology & historical linguistics
17
418 - Standard usage & applied linguistics
53
419 - Sign languages
1
420 - English & Old English
1
430 - Germanic languages; German
36
440 - Romance languages; French
7
480 - Hellenic languages; classical Greek
6
490 - Other languages
26
491 - East Indo-European & Celtic languages
8
492 - Afro-Asiatic languages; Semitic languages
5
496 - African languages
3
500 - Natural sciences & mathematics
732
501 - Philosophy & theory
541
502 - Miscellany
15
507 - Education, research & related topics
69
509 - Historical, geographic & persons treatment
108
510 - Mathematics
1,574
511 - General principles of mathematics
530
512 - Algebra
1,331
514 - Topology
371
515 - Analysis
2,161
516 - Geometry
743
518 - Numerical analysis
448
519 - Probabilities & applied mathematics
2,198
520 - Astronomy & allied sciences
1,003
523 - Specific celestial bodies & phenomena
392
526 - Mathematical geography
66
530 - Physics
2,946
531 - Classical mechanics; solid mechanics
637
532 - Fluid mechanics; liquid mechanics
32
533 - Gas mechanics
32
534 - Sound & related vibrations
158
535 - Light & infrared & ultraviolet phenomena
63
536 - Heat
234
537 - Electricity & electronics
199
538 - Magnetism
81
539 - Modern physics
798
540 - Chemistry & allied sciences
1,130
541 - Physical chemistry
1,236
542 - Techniques, equipment & materials
23
543 - Analytical chemistry
487
546 - Inorganic chemistry
360
547 - Organic chemistry
646
548 - Crystallography
128
549 - Mineralogy
215
550 - Earth sciences
566
551 - Geology, hydrology & meteorology
1,300
553 - Economic geology
30
560 - Paleontology; paleozoology
44
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