400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Histoire+des+livres+populaires+ou+littérature+du+colportage+depuis+l'origine+l'imprimerie+jusqu'à+l'établissement+commission+d'examen+des+livres+du+colportage+charles+nisard 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.