"United States Census, 1860," index, FamilySearch (https://familysearch.org/ark:/61903/1:1:M82K-3DQ : accessed 31 May 2015), Julia Johnson in household of W S Johnson, Boone Township, Hamilton, Iowa, United States; from "1860 U.S. Federal Census - Population," database, Fold3.com (http://www.fold3.com : n.d.); citing p. 10, household ID 85, NARA microfilm publication M653 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 803,323.
"United States Census, 1870," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDVQ-DD6 : accessed 15 April 2015), William S Johnson, Iowa, United States; citing p. 16, family 124, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,893.
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DNA Connections
It may be possible to confirm family relationships with Mary 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 Mary: