There's suspiciously few misspellings in the names of the books, even with words like 'millionaire' and 'righteous'. There's also 'Calculus' with 132 comments and just browsing through the comments I can find at least four different books referenced and some just talking about calculus in general.

That said it's an interesting project that clearly took some effort to put together.

Edit: Saw that the author commented on 'books with similar names. Many of the comments I saw had the books authors name in them as well, next iteration should perhaps look for and match on those as well.