400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Cours+politique+et+diplomatique+Napoléon+Bonaparte+comme+général+chéf+des+armées+républicaines,+comme+premier+consul,+et+comme+empereur+et+roi 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.