400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Nuovissima+Guida+dei+viaggiatori+Italia,+arricchita+di+carte+geografiche+generali+e+postali+(etc.)+[anonymus+ac09922570] 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.