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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.",
  "title": "The Virtue of Selfishness",
  "subtitle": null,
  "slug": "the-virtue-of-selfishness",
  "url": "https://www.kolczanksiazek.pl/ayn-rand/en/the-virtue-of-selfishness",
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  "cover": "https://quivercdn.com/covers/signet/ayn-rand/the-virtue-of-selfishness_978-04-5116-393-6.jpg?v=2026-06-23%2018%3A40%3A11",
  "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...",
  "editions": [
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      "title": "The Virtue of Selfishness",
      "subtitle": null,
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    {
      "title": "La virtud del egoísmo",
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      "title": "Cnota egoizmu. Nowa koncepcja egoizmu",
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      "url": "https://www.kolczanksiazek.pl/ayn-rand/pt/a-virtude-do-egoismo"
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    {
      "title": "Чеснота егоїзму",
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