Deus Ex contains books, newspapers and PDA datacubes that you can read to know more about the world.
After a point, they are becoming less common. The last newspaper that I could ever find in the game before the ending was deeply in the bunkers of MJ12 Ocean Lab. It was about the total collapse (not about "The Collapse", that was one of the endings), and most certainly, last book can be found around this place (I think it must be the 24th chapter of the fictional book "Jacob's Shadow").
But all these are just suggestions. Which is the actual last
- and PDA datacube
can be found in Deus Ex?