400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Beatson's+Political+index+modernised.+dignities;+containing+rolls+official+personages+British+empire,+together+sovereigns+Europe,+peerage+England+Great+Britain;+numerous+other+lists+joseph+timothy+haydn+robert+beatson 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.