There's another version of the book that was created later for set dressing for one of the shows or movies.
It's not anything like the version seen in the episode, but I might do something similar with the synopsis and publisher details since the back cover isn't visible.
The cover photo continues to the spine in the screencap and is actually large enough to go all the way around the back cover, which I believe is accurate to the original.
Here is the back cover from the later alternate version of the book.
And here is my latest revision to the mockup of the cover, still using the low res image as a placeholder.
EDIT: When Riker holds up the book at the end, he flips it around so that the front cover shows, but for a single frame you can see that the full photo goes all the way around the back cover as I had guessed. There is also text formatted similarly to the synopsis on the later version from the auction photo.
