Ancestry.com - Idaho, Naturalization Records, 1868-1985
Original source: Idaho, Oregon, and Washington Petitions for Naturalization, 1932–1991. Records of the District Courts of the United States, RG 21. The National Archives at Seattle, Seattle, Washington. Ancestry.com has searchable indexes; database results and some digitized images are available with a fee-based subscription. Free articles and helpful research materials.