This books is a text for a class taught by New Grounds. But it does stand on its own very well.
The book start off with a historical introduction, then chapters describing techniques to etch and print a plate. After that it goes on to describe different techniques to create and apply grounds: hardground, aquatint, spit bite, softground, crayon softground, liftground, Crisco liftground, color proofing, Chine Collé and finally curing the print. Each chapter goes into step-by-step details to create the ground, etching, timing considerations and finally some common problems and their solutions.
This is a great book for beginners as well as intermediate-level printers. Maybe advanced, I can’t speak to that.