Source Information
Ancestry.com. Minnesota, U.S., Naturalization Card Index, 1930-1988 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2014.
About Minnesota, U.S., Naturalization Card Index, 1930-1988
This collection includes naturalization card indexes from Minnesota.
You can learn more about this collection at the FamilySearch website.