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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.",
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  "binding": "Softcover",
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  "book": {
    "title": "Ekonometria i badania operacyjne",
    "slug": "ekonometria-i-badania-operacyjne",
    "url": "https://www.kolczanksiazek.pl/maria-podgorska/ekonometria-i-badania-operacyjne"
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