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These are 2 great review books. The Update is 678 pages, including an appendix with 400 questions and annotated answers, as well as an extensive index. Averaging fewer than 7 pages per chapter, the 83 chapters can easily be read in less than 3 months. The Update is obviously not meant to be a textbook. For the most part, it helps one to tap into the memories of what one has already learned.