400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Colección+documentos+inéditos+para+historia+España+[ed.]+por+M.+Fernandez+Navarrete+[and+others].+martín+fernández+navarrete 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.