We discussed this “treatise” -The Power of Concentration - by Theron Q. Dumont last year. Librivox has it as an audio recording now. Check it out here.
I have it on in the background right now. What a terrific idea. You can stream it - like I’m doing now and listen to it while you are checking your email (or reading our blog) or you can download it and put it on your mp3 player.