The document summarizes the history of library cooperation in Spain, focusing on the Consorci de Biblioteques Universitàries de Catalunya (CBUC). It describes how CBUC was established in 1996 and has expanded access to documents through a union catalog and interlibrary loan. CBUC also operates the Digital Library of Catalonia and institutional repositories. Key challenges going forward include further developing shared resources and driving organizational cooperation among Catalan libraries.