400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Mémoires+pour+servir+à+l'histoire+France,+sous+le+gouvernement+Napoléon+Buonaparte,+et+pendant+l'absence+maison+Bourbon+jacques+barthélemy+s.+salgues 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.