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I was thinking about this recently and realized that after all the map packs have been released that treyarch should put out a series of books chronicalling the zombie series. At the end of each book they could have a section of things that have historical significance and like spoilers for the next book as well as hints and or an explanation of things in the book ex: relation of teleporters to "The Bell" or why are there traps in shi no numa
this is just a thought but i would certainly read them as this series is rather interesting