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  "formats": "Każda podstrona ma dwie wersje z tymi samymi danymi: JSON (adres strony + .json) i markdown (adres strony + .md). Do każdego `url` w tym dokumencie można dopisać .json albo .md.",
  "title": "What is Epub 3?",
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  "url": "https://www.kolczanksiazek.pl/matt-garrish/what-is-epub-3/9781449317713",
  "publisher": "O'Reilly Media (Z chęcią przeczytam książkę w języku polskim)",
  "publisher_series": [],
  "translators": [],
  "medium": "paper",
  "duration_seconds": null,
  "narrators": [],
  "illustrators": [],
  "cover_artists": [],
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  "published": null,
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  "cover": "https://quivercdn.com/covers/oreilly-media-z-checia-przeczytam-ksiazke-w-jezyku-polskim/matt-garrish/what-is-epub-3_978-14-4931-771-3.jpg?v=2026-04-07%2015%3A42%3A03",
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  "binding": "Softcover",
  "description": "This book discusses the exciting new",
  "book": {
    "title": "What is Epub 3?",
    "slug": "what-is-epub-3",
    "url": "https://www.kolczanksiazek.pl/matt-garrish/what-is-epub-3"
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  "authors": [
    {
      "name": "Matt Garrish",
      "slug": "matt-garrish",
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