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Are you Jack H. Koehler, author of the books below?
The Science of Pocket Billiards by Jack H. Koehler Slingshot Shooting by Jack H. Koehler Upscale One-Pocket by Jack H. Koehler Upscale Nine-Ball by Jack H. Koehler All About Slingshots by Jack H. Koehler Upscale Nine-Ball by Jack H. Koehler


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