I recently found a copy of Pierre Bear by Patsy Scarry (pictures by Richard Scarry). The cover and spine are in good condition with wearing at the top and bottom of the silver spine and around the edge of the covers. There is no writing in it. It is missing the back page which I know is very unfortunate. I was told that this is now very collectible and that even with the missing final page, that I should know its value for insurance purposes. Is there any one in particular who might appraise and value such a book?