"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3SY-BTY : accessed 31 October 2019), Jehu Madden, Clay Township Saltillo Borough, Three Springs borough, Huntingdon, Pennsylvania, United States; citing enumeration district (ED) 84, sheet 2B, family 36, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,414.
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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: