Since 1995, queries can be made at the headquarters of the Library, as all of the Collections were computerised and digitalised.
The access is obtained through a cover letter from the Institution the user belongs to, specifying the subject to be researched.
The Library collaborates with Expositions related to old Collections, held in Spain or in other countries, submitting the works requested by the relevant Institutions.
Prior to the digitalisation, there was a catalogue in 1909 with the information collected from the descriptive sheet of all of the works, prepared by Mr Francisco de Zabálburu and his team.
The sheets were stored in physical filing cabinets designed for such purpose, as all of the works were distributed in the filing cabinets of the Library Room.