There is a series of these sexy typos, many of which have been mentioned before on this blog. This can happen when the delimiter sign disappears or is doubled. There are 9 occurrences of this typo in the OhioLINK catalog, and I even found some in the Library of Congress catalog. WorldCat has so many entries they won't all display.
Make sure your database is not x-rated or these records will be history!
Chicago Public Library