400. That’s an error.

Google cannot redirect you to http://jhupbooks.press.jhu.edu/ecom/MasterServlet/GetItemDetailsHandler?iN=9781421438979&qty=1&source=2&viewMode=3&loggedIN=false&JavaScript=y 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.