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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": "Leon Petrażycki. Challenge to legal orthodoxy",
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  "url": "https://www.kolczanksiazek.pl/krzysztof-motyka/leon-petrazycki-challenge-to-legal-orthodoxy/9788373063334",
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  "cover_artists": [],
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  "binding": "Softcover",
  "description": null,
  "book": {
    "title": "Leon Petrażycki. Challenge to legal orthodoxy",
    "slug": "leon-petrazycki-challenge-to-legal-orthodoxy",
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  "authors": [
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      "name": "Krzysztof Motyka",
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