400. That’s an error.

Google cannot redirect you to http://worldcat.org/search?q=Relacion+historica+del+viage+America+Meridional+hecho+orden+S.+Mag.+para+medir+algunos+grados+meridiano+terrestre+y+venir+por+ellos+conocimiento+verdadera+figura+y+magnitud+tierra,+con+otras+observaciones+astronomicas+y+phisicas+jorge+juan+antonio+ulloa 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.