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There's the original that was released back in 2001 with Halo CE, and a re-release in 2010 just before Halo: Reach. The 2nd version fixes a few errors in the book, but is essentially unchanged. At the end of the book is a sort of appendix featuring letters, reports, ect. that flesh out the canon but don't relate directly to the story. They also did this with The Flood and First Strike.