Theron Q. Dumont 
The Power of Concentration [EPUB ebook] 

To make a success of anything you must be able to concentrate your entire thought upon the idea you are working out. This book has twenty powerful lessons to stimulate, inspire and bring you into perfect harmony with the laws of success! These lessons are very practical and the exercises thoroughly tested. They are arranged so that you will notice an improvement from the very start, and this will give you encouragement.