http://faculty.quinnipiac.edu/libraries/tballard/typoscomplete.html . A check of WorldCat showed the error in 76 records, which confirms the verdict of moderate. In Google, there are more than 200,000 examples, proving that this is a fairly common mistake. As always, we suggest checking each record for context before changing a suspected typo. At the very least, there may be a "sic" present to indicate that the typo is in the original.
Today's photo shows David McCann winning the yellow jersey in stage four of the FBD Ras, an annual bicycle race around Ireland. The original can be found at http://www.pbase.com/image/98462327