400 Generalities
 
 

• 400 Language
• 401 Philosophy & theory
• 402 Miscellany
• 403 Dictionaries & encyclopedias
• 404 Special topics
• 405 Serial publications
• 406 Organizations & management
• 407 Education, research, related topics
• 408 Treatment of language with respect to kinds of persons 
  • 408.9 Treatment of language with respect to specific racial, ethnic, national groups
• 409 Geographical & persons treatment

• 410 Linguistics
• 411 Writing systems
• 412 Etymology, word origins
• 413 Dictionaries
• 414 Phonology
• 415 Structural systems (Grammar)
• 416
• 417 Dialectology & historicl linguistics
• 418 Standard usage; Applied linguistics
• 419 Verbal language not spoken or written

• 420 English & Old English
• 421 English writing system & phonology
• 422 English etymology, word origins
• 423 English dictionaries
• 424
• 425 English grammar
• 426 
• 427 English language variations
• 428 Standard English usage
• 429 Old English (Anglo-Saxon)

• 430 Germanic languages; German
• 431 German writing system & phonology
• 432 German etymology
• 433 German dictionaries
• 434
• 435 German grammar
• 436 
• 437 German language variations
• 438 Standard German usage
• 439 Other Germanic languages

• 440 Romance languages; French
• 441 French writing system & phonology
• 442 French etymology
• 443 French dictionaries
• 444
• 445 French grammar
• 446 
• 447 French language variations
• 448 Standard French usage
• 449 Provençal & Catalan

• 450 Italian, Romanian, Rhæto-Romanic
• 451 Italian writing system & phonology
• 452 Italian etymology
• 453 Italian dictionaries
• 454
• 455 Italian grammar
• 456 
• 457 Italian language variations
• 458 Standard Italian usage
• 459 Romanian & Rhæto-Romanic

• 460 Spanish & Portuguese languages
• 461 Spanish writing system & phonology
• 462 Spanish etymology
• 463 Spanish dictionaries
• 464
• 465 Spanish grammar
• 466 
• 467 Spanish language variations
• 468 Standard Spanish usage
• 469 Portuguese

• 470 Italic languages; Latin
• 471 Classical Latin writing system & phonology
• 472 Classical Latin etymology
• 473 Classical Latin dictionaries
• 474
• 475 Classical Latin grammar
• 476 
• 477 Old, Postclassical, Vulgar Latin
• 478 Classical Latin usage
• 479 Other Italic languages

• 480 Hellenic languages; Classical Greek
• 481 Classical Greek writing system & phonology
• 482 Classical Greek etymology
• 483 Classical Greek dictionaries
• 484
• 485 Classical Greek grammar
• 486 
• 487 Classical Greek language variations
• 488 Classical Greek usage
• 489 Other Hellenic languages

• 490 Other languages
• 491 East Indo-European & Celtic languages 
  • 491.6 Celtic languages
  • 491.7 East Slavic languages; Russian
  • 491.8 Slavic languages
• 492 Afro-Asiatic languages; Semitic 
  • 492.4 Hebrew
• 493 Non-Semitic Afro-Asiatic languages
• 494 Ural-Altaic, Paleosiberian, Dravidian
• 495 Languages of East & Southeast Asia 
  • 495.1 Chinese
  • 495.6 Japanese
  • 495.7 Korean
  • 495.9 Annam-Muong, Mon-Khmer, Thai languages
• 496 African languages
• 497 North American native languages
• 498 South American native languages
• 499 Miscellaneous languages