The Corpus of Ufological Documentation (CDU) is the online compilation project of the electronic (or digitized) documentation generated by the Spanish, or in Spanish, critical ufology, and that otherwise can not be accessible anymore.
The CDU, based on funds from the Ikaros/Anomaly Foundation, aims to provide a disinterested service to the community of ufologists, fans and curious about these issues, while preserving for the future a documentary heritage that represents a cultural asset of undoubted value.