400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Débats+du+procès+instruit+par+Haute-cour+justice,+contre+Drouet,+Baboeuf+et+autres:+Première+séance+du+2+ventose+5 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.