400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=plays Shakespeare, text S. Johnson, prefaces, notes &c. Rowe, Pope many other critics. 6 vols. [in 12 pt. Followed by] Shakespeare's poems william shakespeare 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.