The Library’s long history, since the beginning of the 20th century, has made it possible to compile a considerable bibliographic and documentary collection of some 120,000 monographs and 2,900 titles of periodicals, which can be consulted through the Library. Catalogue of the Library.
It is noteworthy the great richness of its historical background that contains, among other documents, a collection of Municipal Ordinances of the nineteenth century, the publications of the Institute of Social Reforms, whose bibliographic funds it inherited after its disappearance in 1924 - date on which the origin of this Library can be established - and an important and heterogeneous set of printed works and manuscripts of the sixteenth to nineteenth centuries.
The abolition of various bodies in the 1980s meant that the libraries of the Institute of Trade Union Studies, the Institute of Health and Social Security, the Institute of Social Studies, the Institute of Labour and Social Security Studies and the Institute of Mediation, Arbitration and Conciliation were transferred to the Ministerial Library, as had already happened in the 1970s with the library of the School of Social Training of Workers.
On the other hand, the Library has Documentary Repository which preserves, organizes and provides open access to metadata and digital documents from the Department's heritage collection, as well as to copyright-free publications issued by the Ministry of Employment and Social Security.