Classification
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400 - Language
220
401 - Philosophy & theory
5
409 - Geographic & persons treatment
1
410 - Linguistics
319
412 - Etymology
1
413 - Dictionaries
1
414 - Phonology & phonetics
3
415 - Grammar
5
417 - Dialectology & historical linguistics
3
418 - Standard usage & applied linguistics
1
419 - Sign languages
1
430 - Germanic languages; German
5
437 - German language variations
1
450 - Italian, Romanian & related languages
1
453 - Italian dictionaries
1
455 - Italian grammar
1
468 - Standard Spanish usage
1
491 - East Indo-European & Celtic languages
1
492 - Afro-Asiatic languages; Semitic languages
2
494 - Altaic, Uralic, Hyperborean & Dravidian
1
495 - Languages of East & Southeast Asia
14
496 - African languages
1
497 - North American native languages
2
499 - Austronesian & other languages
26
500 - Natural sciences & mathematics
9
501 - Philosophy & theory
9
506 - Organizations & management
1
507 - Education, research & related topics
2
508 - Natural history
3
509 - Historical, geographic & persons treatment
6
510 - Mathematics
605
511 - General principles of mathematics
33
512 - Algebra
150
513 - Arithmetic
22
514 - Topology
51
515 - Analysis
199
516 - Geometry
79
517 - [Unassigned]
21
518 - Numerical analysis
4
519 - Probabilities & applied mathematics
86
520 - Astronomy & allied sciences
3
521 - Celestial mechanics
2
523 - Specific celestial bodies & phenomena
5
526 - Mathematical geography
4
530 - Physics
81
531 - Classical mechanics; solid mechanics
15
532 - Fluid mechanics; liquid mechanics
7
533 - Gas mechanics
1
535 - Light & infrared & ultraviolet phenomena
3
536 - Heat
3
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