400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Recueil+général+des+anciennes+lois+françaises,+depuis+l'an+420+jusqu'à+révolution+1789+alfred+jourdan+decrusy+isambert 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.