The Library’s catalogues are the primary tool for navigating its collections. They enable users to search for books, manuscripts, periodicals, and other materials held by the Library. Please note that not all collections are yet available online. Retrospective data conversion is still in progress; consequently, the online catalogue does not provide complete coverage of the holdings. For a thorough search, it is essential to verify the actual availability of the desired material. If an item is not listed in the OPAC, users should also consult the printed catalogues (both bound volumes and card catalogues) available on site. Only by combining these search tools is it possible to obtain a comprehensive overview of the Library’s holdings.