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- [S809] Marriage License - State of North Dakota - County of Cass, marriage certificate 8576 (1923), Duval-Sauvageau (Reliability: 3).
- [S921] 1920 US Census - Cass County, North Dakota, North Dakota, Cass County, (www.ancestry.com: National Archives and Records Administration, 12 October 2005), T625, roll 1332, Pleasant, enumeration district (ED) 26, sheet 10A, p. 160A(Stamped), dwelling 28, family 31, Albertine Savageau (Reliability: 3).
- [S220] Obitituary, Roger J Duval's - 27 Jun 2007 - The Forum - Fargo, North Dakota (Reliability: 3).
- [S809] Marriage License - State of North Dakota - County of Cass, marriage certificate 8576, Edward Duval and Albertine Sauvageau, 23 Jan 1923.
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