{
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    {
      "title": "Okręty Reichsmarine i Kriegsmarine 1921-1945",
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      "url": "https://www.kolczanksiazek.pl/ulf-kaack/okrety-reichsmarine-i-kriegsmarine-1921-1945",
      "first_published": "2024-01-01",
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    {
      "title": "Niemieckie okręty podwodne. Pełna historia",
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      "url": "https://www.kolczanksiazek.pl/ulf-kaack/niemieckie-okrety-podwodne-pelna-historia",
      "first_published": "2023-05-12",
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}