Several of the books listed here (perhaps every single book) are famous books that are by other people. "Oh, the Thinks You Can Think!" is by Dr. Seuss, for example.
The one I looked at was no longer on amazon, and as it is a kindle edition, we have to keep it as is. No extra data on the cover. For all we know it is the adapted version of the more famous books.
Several of the books listed here (perhaps every single book) are famous books that are by other people. "Oh, the Thinks You Can Think!" is by Dr. Seuss, for example.