| Sources |
- [S67413] Obituary, News Tribune (Tacoma), Margaret B. Niesen, (April 13, 2016).
- [S51230] Death index, Washington, Name: Gregory C Niesen Gender: Male Age: 61 Birth Year: abt 1944 Residence Place: Pierce, Washington, USA Death Date: 15 Aug 2005 Death Place: Pierce, Washington (Reliability: 3).
- [S53585] SSDI: Social Security Death Index, Name: Gregory C. Niesen Social Security Number: 533-42-0849 Birth Date: 3 May 1944 Issue Year: 1960-1961 Issue State: Washington Last Residence: 98499, Tacoma, Pierce, Washington Death Date: 15 Aug 2005 (Reliability: 3).
- [S54084] Marriage index, Washington, Name: Margaret Bertram Whitney Gender: Female Marriage Date: 29 Jul 1939 Marriage Place: Pierce, Washington, United States Spouse: Billy Carter Nieson (Reliability: 3).
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