400. That’s an error.
Google cannot redirect you to http://worldcat.org/search?q=Aristophanous+Kōmōdiai+ennea+meta+scholion+pollōn+palaiōn+kai+pany+ōphelimōn,+...+Aristophanis+Comoediae+nouem+cum+commentariis+antiquis+admodum+utilibus,+duaeque+sine+commentarijs,+adiecto+copiosissimo+indice+omnium+cognitu+dignorum+..+aristophanes 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.