1. Look up Supercookies (If you aren't paranoid enough after you do that, you never will be)
2. Did you buy the book with a credit card? Your credit card is tied into everything. You know that, right?
3. Have you ever written reviews about this book on any site that has your real name, address and/or phone number? Amazon? Do you have an Amazon account and have you searched for, rated or reviewed this book on Amazon? Amazon has a vested interest in keeping detailed records on their customers and they have plenty of shady stuff going on with that Alexa thing so.
The thing about cookies and history is that it's unlikely your computer would have any cookies stored that go back to the 90s unless you have had the same computer since the 90s.
Could also just be a coincidence. Who knows?