400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Le+déïsme+réfuté+par+lui-même,+ou+Examen+des+principes+d'incrédulité+répandus+dans+les+divers+ouvrages+M.+Rousseau,+forme+lettres+abbé+nicolas+sylvester+bergier 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.