Classification
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371 - Schools & their activities; special education
1
374 - Adult education
13
380 - Commerce, communications & transportation
18
381 - Commerce
6
384 - Communications; telecommunication
33
398 - Folklore
1
400 - Language
214
401 - Philosophy & theory
102
407 - Education, research & related topics
3
409 - Geographic & persons treatment
1
410 - Linguistics
329
412 - Etymology
1
414 - Phonology & phonetics
121
415 - Grammar
213
417 - Dialectology & historical linguistics
9
418 - Standard usage & applied linguistics
13
419 - Sign languages
1
420 - English & Old English
69
425 - English grammar
6
427 - English language variations
2
428 - Standard English usage
3
430 - Germanic languages; German
5
435 - German grammar
4
437 - German language variations
1
439 - Other Germanic languages
6
440 - Romance languages; French
52
450 - Italian, Romanian & related languages
1
460 - Spanish & Portuguese languages
10
465 - Spanish grammar
1
468 - Standard Spanish usage
1
470 - Italic languages; Latin
76
475 - Classical Latin grammar
1
480 - Hellenic languages; classical Greek
7
490 - Other languages
7
491 - East Indo-European & Celtic languages
22
492 - Afro-Asiatic languages; Semitic languages
1
494 - Altaic, Uralic, Hyperborean & Dravidian
3
495 - Languages of East & Southeast Asia
7
496 - African languages
1
499 - Austronesian & other languages
12
500 - Natural sciences & mathematics
256
501 - Philosophy & theory
10
507 - Education, research & related topics
1
510 - Mathematics
46
511 - General principles of mathematics
33
512 - Algebra
9
514 - Topology
1
515 - Analysis
2
518 - Numerical analysis
9
519 - Probabilities & applied mathematics
49
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