When I was incarcerated the Chaplain was the one to understand this and act upon it. I called a friend, who bought books at a specific store, that the Chaplain picked up, smuggled into prison and left in my cell. He did this about once a month for a year, about a half dozen books at a time.
Mad respect for this man. He made so many people better for just being around. I stayed friends with him until his end. I hope he met his God as he wanted.