Robert was born about 1915. He was the son of Olaf Martinson and Mabel Morey. He passed away in 2013.
Sources
Find A Grave, database and images (https://www.findagrave.com : accessed 31 March 2018), memorial page for Robert Mason Martinson (19 Jul 1915–24 Nov 2013), Find A Grave Memorial no. 121445793, citing National Memorial Cemetery of Arizona, Phoenix, Maricopa County, Arizona, USA ; Maintained by R.L. Burnside (contributor 47626251) .
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWYX-5JZ : accessed 31 March 2018), Robert Martinson in household of Olaf M Martinson, Minneapolis Ward 3, Hennepin, Minnesota, United States; citing ED 58, sheet 16A, line 30, family 348, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 833; FHL microfilm 1,820,833.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KMT5-M9D : accessed 31 March 2018), Robert Martinson in household of Olaf Martinson, Spirit Lake, Center Grove Township, Dickinson, Iowa, United States; citing enumeration district (ED) 30-3, sheet 3A, line 12, family 58, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1157.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XMNB-G7D : accessed 31 March 2018), Robert M Martinson in household of Olaf M Martinson, Diamond Lake, Dickinson, Iowa, United States; citing enumeration district (ED) ED 5, sheet 5B, line 95, family 27, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 651; FHL microfilm 2,340,386.
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