Biblioteca Virtual de Defensa is Spain's Ministry of Defense portal for digital reproductions from Defense archives, libraries, and museums; its Expedientes OVNI microsite is the official collection for declassified "Avistamientos de fenomenos extranos" case files.12
The microsite says Spain began declassification in 1991, placed a physical copy in the Air Force Central Library in 1992, and now provides online access to 80 dossiers totaling about 1,900 pages.2
The case span runs from San Javier, Murcia in 1962 to Moron, Sevilla in 1995, with summaries that record sighting place, date, facts, considerations, conclusions, and classification or declassification proposals; witness and reporting-officer personal data are omitted after declassification.2
It matters for researchers because the archive joins official digitized Spanish military UFO dossiers with catalog metadata, an advanced search interface, and a title index that exposes records as individual case files rather than a single undifferentiated scan.345
Representative records show the metadata depth: the chronological expediente list is cataloged as a 1991-1992 compound archival unit, the military-norms record covers 1968-1985 with a 1996 declassification note, and cases such as Bardenas Reales, Mazarron, and Canarias preserve dates, authorship, page counts, locations, call numbers, and digital-copy access.56789