400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Épreuve+et+catalogue+des+caractères+l'imprimerie+veuve+Ae.-C.+Stryckwant+à+Bruxelles 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.