This really is the best book for one pocket, as Lenny said. I purchased mine a few years ago. I think I paid around $200 for this and $150 or so for Shots, Moves, and Strategies.
I talked with two high caliber one pocket players about this book. One of them was a top ten american all around player (probably higher than that but I don't want to give his name). He said that he got this book in high school and he honestly credited his knowledge of the game to this book. He said he used to take a few shots in this book and shoot them until he couldn't miss. He would also use the shots given and try to come up with different ways of shooting.
If people put a value on this book as far as the information it can give you, no one here could afford it. That's how strong this book is.