I am wanting to get Yellowstone treasures, but none of the bookstores (even big name chain ones) around me carry it, so I will have to order it. Since I have to order it, I am going to get the ebook on my nook. My issue is, I would like it as soon as possible (NOW!!) and the 4th edition is pre-order only for the ebook, and is not available until August 1st. I can get the 3rd edition immediately (for only 10.00 on bn.com), but just wondered if the 4th edition was enough better that I should wait. I have never been to Yellowstone, and will be spending 2 days there.