My main suggestion is to make your pirate searches using Yandex. Most book names “pdf” will give a result. You can also filter to only show sites of a specific language.
You are not logged in. However you can subscribe from another Fediverse account, for example Lemmy or Mastodon. To do this, paste the following into the search field of your instance: !piracy@lemmy.dbzer0.com
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My main suggestion is to make your pirate searches using Yandex. Most book names “pdf” will give a result. You can also filter to only show sites of a specific language.
I mainly use yandex to search for image sources, it works better than sauce.nao for anime!
PDF isn’t an ebook format which is why EPUB is usually preferred.