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)