400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Cours d'Economie politique: T.2 , T.3:De distribution richesse ,T.4:Exposé des causes physiques, morales et politiques que influent sur production richesse pellegrino rossi 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.