401 Philosophy and theory; international languages
402 Miscellany
403 Dictionaries, encyclopedias concordances
404 Special topics of language
405 Serial publications
406 Organizations and management
407 Education, research, related topics
408 Group of people
409 Geographic treatment and biography
410 Linguistics
411 Writing systems of standard forms of languages
412 Etymology of standard forms of languages
413 Dictionaries of standard forms of languages
414 Phonology and phonetics of standard forms of languages
415 Grammar of standard forms of languages
417 Dialectology and historical linguistics
418 Standard usage (Prescriptive linguistics)
419 Sign languages
420-490 Specific languages
420 English and Old English (Anglo-Saxon)
421-428 Subdivision of English
421 Writing system, phonology, phonetics of standard English
422 Etymology of standard English
423 Dictionaries of standard English
425 Grammar of standard English
427 Historical and geographic variations, modern nongeographic variations of English
428 Standard English usages (Prescriptive Linguistics)
429 Old English (Anglo-Saxon)
430 German and related languages