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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": "Must We Divide History Into Periods?",
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  "url": "https://www.kolczanksiazek.pl/jacques-le-goff/en/must-we-divide-history-into-periods/9780231173018",
  "publisher": "Columbia University Press",
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  "isbn": "978-02-3117-301-8",
  "pages": 184,
  "published": "2017-05-16",
  "language": "en_US",
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  "book": {
    "title": "Must We Divide History Into Periods?",
    "slug": "must-we-divide-history-into-periods",
    "url": "https://www.kolczanksiazek.pl/jacques-le-goff/en/must-we-divide-history-into-periods"
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  "authors": [
    {
      "name": "Jacques Le Goff",
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      "url": "https://www.kolczanksiazek.pl/jacques-le-goff"
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