From a family tree Mabelle Everest-115 forwarded about 1970. Petersen-1298 16:35, 21 September 2014 (EDT)
Based on the birth year given in the family tree the following seems very likely.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X3ZK-RC9 : accessed 27 July 2017), Walter R Blackwood in household of Robert Blackwood, Minneapolis (Districts 1-250), Hennepin, Minnesota, United States; citing enumeration district (ED) ED 156, sheet 20A, line 3, family 163, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1094; FHL microfilm 2,340,829.
"Minnesota Birth Index, 1935-2002," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VC55-NDY : 6 May 2014), Walter Robert Blackwood in entry for Carolyn Blackwood, 20 Sep 1936; from "Minnesota Birth Index, 1935-2002," database, Ancestry (http://www.ancestry.com : 2004); citing Hennepin, Minnesota, United States, Minnesota Department of Health, Minneapolis.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KS2M-NWJ : accessed 27 July 2017), Walter Blackwood, Ward 10, Minneapolis, Minneapolis City, Hennepin, Minnesota, United States; citing enumeration district (ED) 89-318, sheet 9A, line 29, family 185, 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 1988.
"Minnesota Birth Index, 1935-2002," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VC55-WTK : 6 May 2014), Walter Robert Blackwood in entry for Robert Blackwood, 11 Feb 1941; from "Minnesota Birth Index, 1935-2002," database, Ancestry (http://www.ancestry.com : 2004); citing Hennepin, Minnesota, United States, Minnesota Department of Health, Minneapolis.
"Minnesota Death Index, 1908-2002," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V4QH-37Q : 4 December 2014), Walter Robert Blackwood, 08 Oct 1974; from "Minnesota Death Index, 1908-2002," database, Ancestry (http://www.ancestry.com : 2001); citing Meeker, Minnesota, record 1926235, certificate number 026164, Minnesota Department of Health, Minneapolis.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J1GY-G2W : 19 May 2014), Walter Blackwood, Oct 1974; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVGB-6TMS : 13 December 2015), Walter Blackwood, ; Burial, Jennie, Meeker, Minnesota, United States of America, Lake Jennie Covenant Cemetery; citing record ID 132416291, Find a Grave, http://www.findagrave.com.
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