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  "type": "book",
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    "name": "Kołczan Książek",
    "language": "pl-PL",
    "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.",
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      "heading": "Thrillery szpiegowskie"
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    {
      "code": "JB",
      "heading": "Społeczeństwo i kultura – zagadnienia ogólne"
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    {
      "code": "NHW",
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      "medium": "audio",
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      "title": "Firewall",
      "subtitle": null,
      "url": "https://www.kolczanksiazek.pl/andy-mcnab/en/firewall/9780552163552",
      "publisher": "Corgi Books",
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    {
      "title": "Firewall",
      "subtitle": null,
      "url": "https://www.kolczanksiazek.pl/andy-mcnab/en/firewall/9781407039688",
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      "cover_artists": [],
      "isbn": "978-14-0703-968-8",
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