Is this what you're referring to?
Dinosaur Sculpting
On that page it says...
"The book is available from Hell Creek Creations, or Dragon Attack!."
Hell Creek Creations
http://members.aol.com/Hellcreek/
Dragon Attack
http://www.indyrad.iupui.edu/public/jrafert/morales.htm
I checked Amazon. Unfortunately, it's showing up out of print. If you're really interested, I would try contacting Allen or Diane Debus from the Hell Creek site. Just because Amazon doesn't carry it doesn't necessarily mean there aren't any available.