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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": "El mundo y sus demonios",
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  "slug": "el-mundo-y-sus-demonios",
  "url": "https://www.kolczanksiazek.pl/carl-sagan/es/el-mundo-y-sus-demonios",
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  "authors": [
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  "original_title": "The Demon-Haunted World",
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  "description": "¿Estamos al borde de una nueva edad oscura de irracionalismo y superstición? En este libro conmovedor, el incomparable Carl Sagan demuestra con brillantez que el pensamiento científico es necesario para salvaguardar nuestras instituciones democráticas y nuestra civilización técnica. El mundo y sus demonios es el libro más personal de Sagan, y está lleno de historias humanas entrañables y...",
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    {
      "title": "El mundo y sus demonios",
      "subtitle": null,
      "url": "https://www.kolczanksiazek.pl/carl-sagan/es/el-mundo-y-sus-demonios/9788416771592",
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    {
      "title": "El mundo y sus demonios",
      "subtitle": null,
      "url": "https://www.kolczanksiazek.pl/carl-sagan/es/el-mundo-y-sus-demonios/9788416771486",
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      "isbn": "978-84-1677-148-6",
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    {
      "title": "The Demon-Haunted World",
      "language": "en_US",
      "url": "https://www.kolczanksiazek.pl/carl-sagan/en/the-demon-haunted-world"
    },
    {
      "title": "Świat nawiedzany przez demony nauka jako światło w mroku",
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      "url": "https://www.kolczanksiazek.pl/carl-sagan/swiat-nawiedzany-przez-demony-nauka-jako-swiatlo-w-mroku"
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    {
      "title": "O mundo assombrado pelos demônios",
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