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Audio file format - Wikipedia
https://en.wikipedia.org/wiki/Audio_file_format
Audiobook - Wikipedia
https://en.wikipedia.org/wiki/Audiobook
An audiobook (or a talking book) is a recording of a book or other work being read out loud. A reading of the complete text is described as "unabridged", while readings of shorter versions are abridgements . Spoken audio has been available in schools and public libraries and to a lesser extent in music shops since the 1930s.
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