400. That’s an error.

Google cannot redirect you to http://www.amazon.com/exec/obidos/external-search/?field-keywords=Recherches+sur+les+costumes,+les+moeurs,+les+usages+religieux,+civils+et+militaires+des+anciens+peuples+d%27apr%C3%A8s+les+auteurs+c%C3%A9lebres,+et+les+monuments+antiques...&index=books 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.