400-499 Languages
- 400 Language
- 410 Linguistics
- 413 - Travel Dictionary
- 413 - Language Instruction
- 418.02 - Translations
- 419 - Sign Language
- 420 English & Old English
- 423 - Dictionary/Theasaurus
- 423.1 - Rhyming Dictionary
- 428.24 - TOEFL
- 430 Germanic Languages / German
- 440 Romance Languages / French
- 450 Italian, Romanian, Rhaeto-Romanic
- 460 Spanish & Portuguese Languages
- 470 Italic Languages / Latin
- 480 Hellenic languages / Classical Greek
- 490 Other Languages
- 491.62 - Irish Language