Book #20:
The Art and Science of Personal Magnetism-The Secret of Mental Fascination by Theron Q. Dumont

This book really opened my eyes. It is full of "Metaphysical" teachings and exercises.

It is very different from all of the other books and yet still focuses on personal power and taking control of your mind and your thinking.

Try some of the exercises there and see how you go.

Also read "The Power of Concentration"