400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Histoire+Parlementaire+Revolution+Francaise,+Ou+Journal+des+Assemblees+nationales,+Depuis+1789+Jusqu'En+1815.+p.+j.+b.+buchez+p.+c.+roux 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.