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 by James F. Simon. If you search for the isbn, 074325032x, on the book, you will find that it also links to Whistling past Dixie: how Democrats can win without the South by Thomas F Schaller. According to Amazon, the correct isbn is 0743290151. 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?