I saw Ed McMahon's book "The Art of Public Speaking" recommended by someone recently. I forget who it was, but it was someone I respected and they were writing after his passing. So I immediately jumped over to Amazon and purchased a used copy.
It arrived recently and I'm just starting to dig in to see what I can learn. Between my own speaking efforts and being a merit badge counselor for the Boy Scouts, I think I ought to learn more about it. I'm tempted to hit a local Toastmasters meeting, though I'm not sure where I'll find the time.