400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Corpus Francicae historiae veteris et sincerae [par Marquard Freher]. quo prisci eius scriptores ... emendati, et pro ordine temporum dispositi, pseudepigrapha veris auctoribus suis restituta... uno volumine exhibentur. Quorum elenchum praecedens operis initium pagina continet [Ivanis Carnotensis excerpta ..., S. Gregorii Turonensis...gesta Francorum epitomata..., Fredegarii...chronicae...] marquard freher 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.