400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Cours+mathematique,+qui+contient,+toutes+les+parties+cette+science,+mises+portee+des+commencans.+Par+M.+Chretien+Wolf+...+Traduit+Francois+augmentee+considerablement+par+D.***+...+Tome+premier+[-troisieme!+..+christian+wolff 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.