I honestly always assumed that someone else was a ghost writer for those books as a cover for Nolan. After all, I assumed he didn’t care / have time to write when he was out being a superhero.

I guess it’s possible that he actually wrote them, but I assumed that “Read my books” was a way for Mark to go to those specific books and find whatever is inside, written in the margins, etc.

I say that because the show puts a lot of emphasis on Debbie putting the books away and deliberately shows them being placed on the sidewalk to be thrown away. I get the feeling those specific books will be important.

I think that’s pretty clear with how asking Mark to read his books would probably be the last thing on his mind at that moment, unless they contained something very important.

And then it’s contrasted with Debbie throwing the whole set of books out at that very moment. I imagine Mark will have a hell of a time tracking those down to actually read them by the time he gets back to earth. Since it already took him 6 days to get there (with a working Thraxans ship that he might not have anymore), the books will be long gone.