Imgur user JWaldman explains that this little project started off as a surprise wedding gift for a friend, which was pretty much a running list of fake trivia they had made up. And it took a life of its own when he noticed they could order a bunch of these books and leave them for folks at bookstores.
JWaldman also mentions that the books look legit, as they have a copyright page, ISBN number and publisher info. Check out the inside of these books below:
And if you want your own copy you can head here.
Now see what this guy did: Guy Brings Hilarious Fake Books Covers On The Subway