Back when I was taking cataloging a decade or so ago, I had a Professor who had what I have found to be a pretty unique perspective: She detested OCLC. She considered WorldCat to be filled with errors and problems. While she may have been a little harsh, she did have a point. For example, in front of me right now, I have “Lincoln and Chief Justice Taney: Slavery, Secession, and the President’s War Powers(Lincoln and Chief Justice Taney: Slavery, Secession, and the President’s War Powers)”:http://catalogablog.blogspot.com/2006/10/oclc-interim-support-for-isbn-13.html by James F. Simon. If you search for the isbn, “074325032x(Search results for ‘074325032x’)”:http://www.worldcat.org/search?qt=worldcat_org&q=074325032x&submit=Search, on the book, you will find that it also links to “Whistling past Dixie: how Democrats can win without the South(Whistling past Dixie: how Democrats can win without the South)”:http://www.librarything.com/isbn/0743290151 by Thomas F Schaller. According to Amazon, the correct isbn is “0743290151(Search results for ‘0743290151’)”:http://www.amazon.com/exec/obidos/ASIN/0743290151/libraryplanetcom. In the end, it turns out the Schaller book shows both versions of the ISBN and that is why it is searchable either way. My question is, is a mistake presumably made in a CIP record worth keeping?