400. That’s an error.

Google cannot redirect you to http://www.amazon.com/exec/obidos/external-search/?field-keywords=Oeuvres+Fran%C3%A7ois-Guillaume-Jean-Stanislas+Andrieux...&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.