SteveR wrote:
For an extended manual, Darrell Young's Mastering the Nikon D7200 would be the best thing for you. It's not a book on how to take pictures, but goes more in depth on each function of the camera than the manual does. I have the book on the D800, and the section on focusing, for instance, is 26 pages.
I also have this book & can't recommend it too highly.