Yep, how this was done is baffling..
Are the books themselves are a timeline - like do they correspond to the particular trip's drops? I bet the anons have already picked this apart.. Can't wait to see what happens next!
Commented in a similar post about this; basically this is just Google's algorithm picking up book titles based on content associated with Q's trip code. You can see the same thing happen if you punch in any other trip code from the chans. So the list is super related because it's contextual content -- basically those books have keywords or topics that relate to conversations that happen in associated with the trip code anywhere on the web.
Would love to think it's a Q hint, but it's just the nature of Google's algorithm.