If you are looking for a book about automatic cannon, it would be hard to imagine a better option.
Autocannon is lavishly illustrated, both in color and B&W. No matter what section of the book you are reading, it is extremely well illustrated. I'm very happy I have a copy of this one and I highly recommend it to any cartridge collector.
This book does a spectacular job of covering the many automatic cannon designs from the late 1800s up to current types. And as the title suggests, it also covers the ammunition associated with these designs.