400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Les+jansénistes+du+xvii+e+siècle,+leur+histoire+et+leur+dernier+historien,+m.+Sainte-Beuve+[in+his+Port+Royal].+edmond+frédéric+fuzet+(abp.+rouen.) 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.