http://dewey.info/scheme/e22/
400 Language
420 English & Old English languages
420 English & Old English 421 English writing system & phonology 422 English etymology 423 English dictionaries [424] [Unassigned] 425 English grammar [426] [Unassigned] 427 English language variations 428 Standard English usage 429 Old English (Anglo-Saxon)
Dewey Decimal Classification: Summaries
Available languages: af | ar | de | en | es | fr | no | pt | ru | sv | zh
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