400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Cours+alphabétique+et+méthodique+droit+canon+dans+les+rapports+avec+le+droit+Eclesiástique:+R-W+(1860.+568+p.)+michel+andré+abbé 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.