"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6QL-NC7 : accessed 26 September 2017), Richard A Keller in household of Amos R Keller, Middletown, Frederick, Maryland, United States; citing ED 66, sheet 10B, line 82, family 36, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 672; FHL microfilm 1,820,672.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X34J-714 : accessed 26 September 2017), Richard A Keller in household of Amos R Keller, Middletown, Frederick, Maryland, United States; citing enumeration district (ED) ED 17, sheet 8B, line 58, family 172, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 874; FHL microfilm 2,340,609.
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DNA Connections
It may be possible to confirm family relationships with Richard by comparing test results with other carriers of his ancestors' Y-chromosome or 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 Richard: