400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Excerpta+ex+P.+Ovidii+Nasonis+carminibus+[ed.,+Engl.+notes+M.+Isler].+publius+ovidius+naso because the request was invalid.

This might be because the link was created a long time ago. Try your search again on Google. That’s all we know.