400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Artemisia,+ein+Singspiel,+welches+auf+dem+königl.+Pohln.+Churfürstl.+Sächß.+Hof-Theater+Dresden+zur+Carnevals-Zeit+ist+aufgeführet+worden.+Im+Jahr+1755.+(ital.+u.+deutsch) 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.