400. That’s an error.

Google cannot redirect you to http://abebooks.co.uk/servlet/SearchResults?tn=Hieronymi+Cardani+Mediolanensis+...+Opera+omnia:+tam+hactenus+excusa%3B+h%C3%AEc+tamen+aucta+emendata%3B+qu%C3%A0m+numquam+ali%C3%A0s+visa,+ac+prim%C3%B9m+ex+auctoris+ipsius+autographis+eruta:+cur%C3%A2+Caroli+Sponii,+doctoris+medici+collegio+medd.+Lugdun%C3%A6orum+aggregati.+Tomus+primus+%5B-decimus%5D 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.