This is a sub-service of the sameAs service, and contains only information that is provided by a third party.
The data presented here comes from the Biblioteca Nacional de España (http://datos.bne.es)
Why not try finding equivalent identifiers for http://datos.bne.es/resource/XX1000010?
Current statistics for this sameAs service (http://sameas.org/store/bne/) —
Last data assertion 2014-12-15 01:55:37 Number of URIs 1910256