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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": "The Virtue of Selfishness",
  "subtitle": null,
  "url": "https://www.kolczanksiazek.pl/ayn-rand/en/the-virtue-of-selfishness/9780451163936",
  "publisher": "Signet",
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  "translators": [],
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  "isbn": "978-04-5116-393-6",
  "pages": 176,
  "published": "1964-11-01",
  "language": "en_US",
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  "markdown": "https://www.kolczanksiazek.pl/ayn-rand/en/the-virtue-of-selfishness/9780451163936.md",
  "binding": "Softcover",
  "description": "A collection of essays that sets forth the moral principles of Objectivism, Ayn Rand's controversial, groundbreaking philosophy. Since their initial publication, Rand's fictional works—Anthem, The...",
  "book": {
    "title": "The Virtue of Selfishness",
    "slug": "the-virtue-of-selfishness",
    "url": "https://www.kolczanksiazek.pl/ayn-rand/en/the-virtue-of-selfishness"
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  "authors": [
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      "name": "Ayn Rand",
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