"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MSNY-363 : accessed 01 Nov 2014), Dora M Hart in household of Frank Hart, Pickney Township, Lewis, New York, United States; citing sheet 2A, family 35, NARA microfilm publication T623, FHL microfilm 1241070.
"New York, County Marriages, 1908-1935," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XVGB-K9J : accessed 01 Nov 2014), Brainard E. Petrie and Dora M. Hart, 24 Jul 1917; citing 275, , New York, United States; FHL microfilm 895215.
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DNA Connections
It may be possible to confirm family relationships with Dora 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 Dora: