400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Les+caractères+Bruyère.+[With]+Les+caractères+Théophraste,+tr.+par+Bruyère,+avec+des+additions+et+des+notes+nouv.+par+J.G.+Schweighæuser+jean+bruyère 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.