| Sources |
- [S6] 1940 U.S. Federal Census , 1940 United States Federal Census.
Year: 1940; Census Place: Grant, Richland, North Dakota; Roll: m-t0627-03011; Page: 1B; Enumeration District: 39-23
- [S4] 1950 U.S. Federal Census , 1950 United States Federal Census.
National Archives at Washington, DC; Washington, D.C.; Seventeenth Census of the United States, 1950; Year: 1950; Census Place: Grant, Richland, North Dakota; Roll: 2027; Page: 3; Enumeration District: 39-23
- [S1] Ancestry Family Trees , Ancestry Family Trees.
Online publication - Provo, UT, USA: Ancestry.com. Original data: Family Tree files submitted by Ancestry members.
- [S3] Newspapers.com , North Dakota, U.S., Newspapers.com™ Stories and Events Index, 1800's-current.
Grand Forks Herald; Publication Date: 3 Feb 1953; Publication Place: Grand Forks, North Dakota, USA; URL: https://www.newspapers.com/image/1133629642/?article=707992dd-65eb-4e73-8742-aeca55b71400&xid=5590&terms=Jim_a_Mattson
- [S101] North Dakota State Death Certificates, North Dakota, U.S., State Death Certificates, 1908-2007.
North Dakota Department of Health. North Dakota Death Records. Bismark, North Daktoa: North Dakota Department of Health.
- [S5] Social Security Death Index , Social Security Death Index.
Social Security Administration; Washington D.C., USA; Social Security Death Index, Master File
- [S30] U.S. School Yearbooks , U.S. School Yearbooks.
"U.S., School Yearbooks, 1880-2012"; School Name: North Dakota State College of Science; Year: 1956
- [S2] U.S. Find a Grave , U.S., Find A Grave Index, 1700s-Current.
https://www.findagrave.com/memorial/194370867/james-andrew-mattson
- [S13] U.S. Public Records Index , U.S., Index to Public Records, 1994-2019.
- [S109] U.S. Korean War Era Draft Card, U.S., Korean War Era Draft Cards, 1948-1959.
National Archives at St. Louis; St Louis, MO, USA; Record Group: Records of the Selective Service System, 1926-1975; Record Group Number: 147; Series: Post-WWII through Vietnam Era Selective Service Records, North Dakota; Series Number: 147-76A-0377
- [S16] U.S., Social Security Applications , U.S., Social Security Applications and Claims Index, 1936-2007.
- [S120] North Dakota County Marriages, North Dakota, U.S., Select County Marriages, 1890-2020.
State Historical Society of North Dakota; Bismarck, North Dakota, USA; Marriage Records
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