I just picked up two books:
Project Azorian, the CIA and the raising of the K-129. Just started reading it, I'm familiar with the story, but this is supposed to be the most detailed account ever put to paper.
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Notes of a Russian Sniper--Vassili Zaitsev. This seems to be a revamping of the 1971 edition to ensure the translation was correct.
I'll wait until I finish Project Azorian before I start Zaitsev's book.