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    "name": "Kołczan Książek",
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    "url": "https://www.kolczanksiazek.pl"
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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": "Journey to the Center of the Earth",
  "subtitle": null,
  "url": "https://www.kolczanksiazek.pl/jules-verne/en/journey-to-the-center-of-the-earth/9780553213973",
  "publisher": "bantam",
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  "translators": [],
  "medium": "paper",
  "duration_seconds": null,
  "narrators": [],
  "illustrators": [],
  "cover_artists": [],
  "isbn": "978-05-5321-397-3",
  "pages": 240,
  "published": "1991-10-01",
  "language": "en_US",
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  "markdown": "https://www.kolczanksiazek.pl/jules-verne/en/journey-to-the-center-of-the-earth/9780553213973.md",
  "binding": "Softcover",
  "description": "The intrepid Professor Lindenbrock embarks upon the strangest expedition of the nineteenth century: a journey down an extinct Icelandic volcano to the Earth’s very core. In his quest to penetrate...",
  "book": {
    "title": "Journey to the Center of the Earth",
    "slug": "journey-to-the-center-of-the-earth",
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  "authors": [
    {
      "name": "Júlio Verne",
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