One of the largest historical repositories worldwide staging an intensive effort to digitalize its extraordinay collection. National Archives and Records Administration (NARA) is an independent US Federal agency gathering documents from the executive, legislative, and judicial branches of the Federal Government. The AAD is its online catalogue, currently containing 20% of NARA holdings, while the Microfilm Catalog is a database of almost 3,400 publications but most of their roll lists and descriptive pamphlets are not online. Online access to a selection of nearly 50 million historic electronic records on a wide range of topics is also possible. In the Theachers’ Resources section, users can also visit the Digital Classroom Archives and the Presidential Libraries’websites, as well as enter in the Archives Library’s OPAC containing nearly 75,000 bibliographic records. As NARA records digitalization is still in progress, many records are fully available only by purchase or on-site. Parts of the periodicals databases are provided by other services, therefore subscription (public, academic or individual) may be required.