Steven Dove Reference Book value?

What's the value of the "Service Bulletins" GS Entusiast Reference Book by Steven Dove?

Thanks.

 

Check ($47-125.00 USD) here:
http://www.amazon.com/gp/offer-listing/0962105910/ref=dp_olp_used?ie=UTF8&condition=used

 

What is the book about?

 

My guess would be it's a collection of Service Bulletin's which were
distributed to Buick Dealerships (and possibly to Buick authorized
service facilities). Service bulletins can be both Recall Notices and
"voluntary repair" notices.