History of the CPSU (B) A Short Course is good.
Edit: Accidentally linked the wrong PDF.
Talk about whatever, respecting the rules established by Lemmygrad. Failing to comply with the rules will grant you a few warnings, insisting on breaking them will grant you a beautiful shiny banwall.
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The book by the same title - The Russian Revolution by Rosa Luxemburg.
It’s a critique, but it provides a great dialectical analysis of the Revolution and why it happened in its conditions.
Ten days that shook the world - john reed
Technically not a book but a podcast, but I find it a great resource on the subject: https://rss.com/podcasts/sovietpod/