"Iowa Marriages, 1809-1992," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XJ42-RQT : 10 February 2018), Dewey L Blackman and Emilie Riecke, 08 Apr 1922; citing Davenport, Iowa, reference 29503; FHL microfilm 1,479,414.
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DNA Connections
It may be possible to confirm family relationships with Dewey by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Dewey: