"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M66Z-8XM : 14 July 2016), Effa Black in household of J C Black, Kings Prairie, Barry, Missouri, United States; citing enumeration district ED 2, sheet 229B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0672; FHL microfilm 1,254,672.
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DNA Connections
It may be possible to confirm family relationships with Effa by comparing test results with other carriers of her ancestors' mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Effa: