400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Observations+upon+consequences+apprehended+concession+Roman+Catholic+claims,+menacing+security+established+Church+[by+F.+Nolan].+frederick+nolan 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.