Significance of books?

Is it me or did anyone else find the importance of books in the film?

Not only did they communicate through books but Cooper was literally pushing books onto Murph. In the movie he tried to make him STAY but I found it as a great metaphor of actually pushing books onto the audience, as to show that all answers and knowledge are in books. Inspiring us to read more.

It's just one of those small details I love about Nolan. Like the dust over the ranger toy implying how we stopped being explorers, worrying about our place in the dirt.