400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Kayserlich-+Koeniglicher,+wie+auch+Roemisch-Koeniglicher,+Erz-Herzoglicher,+dann+dero+Haupt-+Residenz-Stadt+Wien+Staats-+Standes-Calender+[anonymus+ac09610615] 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.