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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": "Rozwój daje radość",
  "subtitle": null,
  "url": "https://www.kolczanksiazek.pl/jacek-kielin/rozwoj-daje-radosc/9788374895064",
  "publisher": "Gdańskie Wydawnictwo Psychologiczne (GWP)",
  "publisher_series": [],
  "translators": [],
  "medium": "paper",
  "duration_seconds": null,
  "narrators": [],
  "illustrators": [],
  "cover_artists": [],
  "isbn": "978-83-7489-506-4",
  "pages": 300,
  "published": "2013-01-01",
  "language": "pl_PL",
  "cover": "https://quivercdn.com/covers/gdanskie-wydawnictwo-psychologiczne-gwp/jacek-kielin/rozwoj-daje-radosc_978-83-7489-506-4-8d8e00a0.jpg?v=2026-09-02%2022%3A36%3A04",
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  "markdown": "https://www.kolczanksiazek.pl/jacek-kielin/rozwoj-daje-radosc/9788374895064.md",
  "binding": "Softcover",
  "description": "Nowe, poszerzone i uaktualnione",
  "book": {
    "title": "Rozwój daje radość",
    "slug": "rozwoj-daje-radosc",
    "url": "https://www.kolczanksiazek.pl/jacek-kielin/rozwoj-daje-radosc"
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  "authors": [
    {
      "name": "Jacek Kielin",
      "slug": "jacek-kielin",
      "url": "https://www.kolczanksiazek.pl/jacek-kielin"
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}