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The book is called Championship Fighting: Explosive Punching and Aggressive Defense.
Here is a pdf: https://newschoolsinger.com/wp-content/uploads/2018/11/jack-dempsey-championship-fighting-1.pdf
If that is called a Mexican hook, then what is a shovel hook?
His follow up book is even better: Championship Shitting: Explosive Diarrhea and Aggressive Wiping.
Hard to find it in print these days.