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FamilySearch.org - Washington, County Naturalization Records, 1850-1982
This collection includes records of naturalization proceedings from Clark, Cowlitz, Grays Harbor, King, Kitsap, Lewis, Mason, Pacific, Pierce, Skamania, Thurston and Wahkiakum Counties. The records include petitions, declarations of intention, certificates, depositions and final papers. The records are arranged chronologically.
Washington State Digital Archives
Index and digital images of state and local vital, military and legal records for Washington State residents from the 1840s to date.