Ancestry.com. Microfilm Resources for Research: A Comprehensive Catalog [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 1997.Original data: United States, National Archives and Records Administration. Microfilm Resources for Research: A Comprehensive Catalog. Washington, D.C.: National Archives and Records Administration, 1996.
The National Archives and Records Administration is responsible for administering and making available for research records of the federal government which are considered "permanently valuable," yet are "noncurrent." This catalog, listing more than 2,000 microfilm publications available from the National Archives, identifies a wide range of historical and genealogical material useful for research.