I picked up a cool book last weekend at Half Price Books. When I usually look at technical books in the Engineering section, I get overwhelmed by all of the formulas and math, but this one has great pictures of the shapes of dies and the things being pressed. I could see this book coming in handy if I ever get to the cnc mold making that I've been thinking about. It talks about all of the ins and outs of making dies. Good stuff and not way over my head. Gotta love the used book store!