400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Colección+documentos+inéditos+relativos+al+descubrimiento,+conquista+y+colonización+las+posesiones+españoles+América+y+Occeanía+[sic],+sacados+bajo+direccion+J.F.+Pacheco,+F.+Cárdenas+y+L.+Torres+Mendoza+joaquin+francisco+pacheco 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.