State by state, county by county, city by city, the Guide to Naturalization Records identifies all repositories of naturalization records, systematically indicating the types of records held, their dates of coverage, and the location of original and microfilm records. The Guide also pinpoints the whereabouts of federal court records in all National Archives facilities, and identifies every single piece of information on naturalizations that is available on microfilm through the National Archives or the Family History Library System, including the call numbers used by each institution.