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JP said: I agree with Shadygirl.  Mr. Farenheit's idea is awesome.  A tag of some sort on the flyleaf and a timeline on the first page inside the cover lets a reader quickly see where the book generally falls.  That way the timeline endures.  More specific info about the books in a specific segment of the timeline (e.g. order to read them, relationship of the books) could be elsewhere if necessary or useful.