Ran across this site that has Hoppe's book on billiards. When I bought the book back in the '60's it quickly became my 'bible' on the mechanics of the game. Since it's hard to come by I suspect most members haven't had the chance to read it. There's also some interesting stories that Hoppe tells about some of his tournament play and other pros he toured with. Enjoy.
https://babel.hathitrust.org/cgi/pt?id=inu.30000011917675;view=1up;seq=6
https://babel.hathitrust.org/cgi/pt?id=inu.30000011917675;view=1up;seq=6