Within the LBF library, mentions should be made of the the newspaper library, with more than 8,000 titles, dating from the end of the late nineteenth century to the present. It is worth mentioning the political titles from the 1970s, those that appeared during Franco's dictatorship in exile or in hiding and, in general, those related to politics and social movements published from 1970 to the present day, many of them of little diffusion and not kept elsewhere.
The Library of the Monastery of the Benedictines of Lazkao and the Basque Library formed by Juan José Agirre can be consulted at the foundation itself. The catalog is in the Euskadi Collective Catalogue.