Fascinating book with a great range of information. There's a lot of industrial-scale stuff, but also a lot of information that would benefit hobbyists and tinkerers. The information on electrochemical and ultrasonic machining alone was worth reading the book for. I was fortunate to pick up volumes 4,5, and 6- really looking forward to reading the other two I have, and I'll definitely be keeping an eye out for 1-3 and 7-12.