400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Dictionnaire+médecine,+chirurgie,+pharmacie,+des+sciences+accessoires+et+l'art+vétérinaire+ouvrage+contenant+synonymie+latine,+grecque,+allemande,+anglaise,+italienne+et+espagnole+et+le+glossaire+ces+diverses+langues+par+˙.+Littré,+Ch.+Robin+˙mile+littré+charles-philippe+robin 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.