"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWX5-QSK : 10 August 2016), Laura Orr in household of Martha Hamler, Limestone, Clarion, Pennsylvania, United States; citing enumeration district ED 71, sheet 183D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1117; FHL microfilm 1,255,117.
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DNA Connections
It may be possible to confirm family relationships with Laura 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 Laura: