I'd be interested also in hearing from someone who has the book.
It's listed on Amazon.com for $15. You will find it easier to find if you search for the actual title "Honda SOHC Fours (The Essential Buyer's Guide)".
I looked through the preview pages including the contents and it seems exclusively to give simple advice for a novice who is considering buying a SOHC4, most of which you'd already know (or would have learned the hard way) if you have one.