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Patty, I liked history in school. I did well in it, but I'm sure I need a refresher course. The Gettsburg tour will be just that.
Even if history is not your thing, you might still want to pick up a copy of the "Killer Angels" and read it before the PA trip. It is an amazingly good read of the Battle at Gettysburg. It is not at all like text book reading either. I really enjoyed it. I'm reading it for the second time now, and I'm almost finished.