{
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    "name": "Kołczan Książek",
    "language": "pl-PL",
    "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": "La Primera Cruzada",
  "subtitle": null,
  "slug": "la-primera-cruzada",
  "url": "https://www.kolczanksiazek.pl/peter-frankopan/es/la-primera-cruzada",
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  "markdown": "https://www.kolczanksiazek.pl/peter-frankopan/es/la-primera-cruzada.md",
  "authors": [
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      "name": "Peter Frankopan",
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  "original_title": "The First Crusade",
  "original_language": "en",
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      "code": "J",
      "heading": "Społeczeństwo i nauki społeczne"
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      "heading": "Historia"
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  "series": [],
  "cover": "https://quivercdn.com/covers/editorial-critica/peter-frankopan/la-primera-cruzada_978-62-8000-245-3.webp?v=2026-04-20%2006%3A13%3A42",
  "description": "Según la tradición, la Primera Cruzada comenzó por instigación del papa Urbano II y culminó en julio de 1099, cuando miles de caballeros de Europa occidental liberaron Jerusalén de la creciente amenaza del islam. Pero ¿y si el verdadero catalizador de la Primera Cruzada se encontrase más al este de Roma? Frankopan, a diferencia de la mayoría de historiadores de la Primera Cruzada que...",
  "editions": [
    {
      "title": "La Primera Cruzada",
      "subtitle": null,
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      "isbn": "978-62-8000-245-3",
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    {
      "title": "La Primera Cruzada",
      "subtitle": null,
      "url": "https://www.kolczanksiazek.pl/peter-frankopan/es/la-primera-cruzada/9788491993735",
      "publisher": "Editorial Critica",
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      "isbn": "978-84-9199-373-5",
      "pages": 392,
      "published": "2022-01-19",
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  "other_languages": [
    {
      "title": "Kriegspilger",
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    {
      "title": "The First Crusade",
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      "url": "https://www.kolczanksiazek.pl/peter-frankopan/en/the-first-crusade"
    },
    {
      "title": "La première croisade",
      "language": "fr_FR",
      "url": "https://www.kolczanksiazek.pl/peter-frankopan/fr/la-premiere-croisade"
    },
    {
      "title": "Pierwsza krucjata. Wezwanie ze Wschodu",
      "language": "pl_PL",
      "url": "https://www.kolczanksiazek.pl/peter-frankopan/pierwsza-krucjata-wezwanie-ze-wschodu"
    },
    {
      "title": "A Primeira Cruzada",
      "language": "pt_PT",
      "url": "https://www.kolczanksiazek.pl/peter-frankopan/pt/a-primeira-cruzada"
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