400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Vita+et+miracula+sanctissimu+patris+Benedicti+ex+libro+II+dialogorum+Beati+Gregorii+papae+et+monachi+collecta+aliprando+caprioli 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.