One thing that's good to be aware of, is that any "bookshelf" listing like that is reliant on having a volunteer manually add books to it. So there is no guarantee of the list being complete or up to date.
Some Bookshelfs may just be a list that one volunteer made once upon a time, and has not been updated since.
With that said, it's still a valuable thing to do, as long as we keep in mind the limitations of it.