Are all of the historical materials open to research?
While the majority of the Library’s holdings are available to research, some records are unavailable. In some cases, the records themselves might as of yet be unprocessed. (Unprocessed means the material has not yet been arranged, described, preserved, and/or reviewed for restrictions.) Details regarding Access and Use Restrictions with regards to unprocessed collections typically can be found via the National Archives Catalog (NAC).