400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Vita di Poggio Bracciolini scritta inglese dal rev. Guglielmo Shepherd e tradotta dall' avv. Tommaso Tonelli con note ed aggiunte. Tomo primo [-secondo] 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.