My copy of Harnessing Hibernate has the ISBN of 978-0-596-51772-4. When I try to register it (starting with the 0) I get "Could not find the book(s) you entered. Please check the ISBNs and try again."
Also, the book says that the files from the book would be on the page. I couldn't find them.
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As for registering the book, if you're starting from the 0 while using the 13 digit ISBN, that won't work. Please use the full 13 digit ISBN without the dashes to register the book.