Good Yoyo books

Any good yoyo books?
I got some old trick books from 90s but after stuff like history of yoyo / running a yoyo company / theory of yoyo or just any books that main topic is yoyo

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How to Run a Boutique Yoyo Business by J. D. McKay is a good book that gives advice and tricks to starting your own small yoyo company

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