"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MN62-LWR : 12 April 2016), Mary Ellen Clark in household of Frank Moore, California, United States; citing p. 4, family 50, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,576.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6P3-KK4 : 12 August 2017), Mary E Clark in household of John Clark, Indian Township, Plumas, California, United States; citing enumeration district ED 85, sheet 459B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0070; FHL microfilm 1,254,070.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9P1-P35 : accessed 2 February 2018), Mary E Collier in household of Laura E Clark, Indian Township, Plumas, California, United States; citing enumeration district (ED) 101, sheet 19A, family 182, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,096.
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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: