The facility is the largest public genealogy center in America, with a genealogical research staff of 20 persons. Its inventory includes U.S. census records, Civil War histories, immigration and naturalization records, Native American records, biographical archives, manuscripts pertaining to the American slave trade and the antebellum south and a large variety of state records for Missouri and other states, such as tax records, penitentiary records, military service records, genealogical periodicals and 60,000 titles of family genealogies.