I don't think it's a canonical ISBN, based on the info on Amazon's pages, there are two different ISBN's. Here's the product details for the book with those image URL's:
Code:
# Reading level: Young Adult
# Paperback: 544 pages
# Publisher: Little, Brown Young Readers (September 6, 2006)
# Language: English
# ISBN-10: 0316015849
# ISBN-13: 978-0316015844
# Product Dimensions: 8 x 5.5 x 1.6 inches
You'll note there are two ISBN's types listed there. ISBNDB (always??) uses the ISBN-13 ISBN, where as the amazon url format that the original poster highlights only supports ISBN-10.
I didn't bother reading this fully as it's a bit late for me in my part of the world, but it looks to me like to get ISBN-10 from ISBN-13 you need to drop off the first three digits and the hyphen. You then drop off the 10th digit and use the wikipedia algorithm to calculate what the final digit of the original 10 digit ISBN-10 should be.
Algorithm here:
http://en.wikipedia.org/wiki/Isbn#ISBN-10
Not entirely sure I got that all right, but I did read through it a second time and it seems like that might work...