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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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  "url": "https://www.kolczanksiazek.pl/edmund-niziurski/naprzod-wspaniali",
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      "publisher": "Greg",
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      "medium": "paper",
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    {
      "title": "Naprzód, Wspaniali!",
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      "url": "https://www.kolczanksiazek.pl/edmund-niziurski/naprzod-wspaniali/9788375882179",
      "publisher": "Firma Księgarska Jacek i Krzysztof Olesiejuk - Inwestycje",
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      "isbn": "978-83-7588-217-9",
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