If you own any Alfa Romeo from about 1960 onwards, chances are it shares part or all of its design and/or construction with the cars covered in this book.
If you never lay a spanner or pint of oil on your Alfa Romeo yourself, this book is worth skimming through to find out what your mechanic actually does for all that money.
If you, like most Alfa Romeo owners, do spend some time on your own spannering, this manual will be a welcome to discover atleast something more. I don't own an Alfetta but there is enough commonality between all the 4 cylinder models and the de dion cars of the 80s and 90s that this book has helped me a few times with my Giulia Super and my 75.
The best thing is that gives you more information, hopefully filling in some of the holes inevitably left in your mind by other manuals. This book actually covers some things in a little bit more detail (text, photos and diagrams) than some other manuals.