400. That’s an error.

Google cannot redirect you to http://www.amazon.com/exec/obidos/external-search/?field-keywords=Manual+completo+desamortizaci%C3%B3n+civil+y+eclesi%C3%A1stica&index=books 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.