"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K9S9-HBN : accessed 6 June 2016), Mary Oster in household of John Oster, Ward 12, Centralia, Centralia Election Precinct, Lewis, Washington, United States; citing enumeration district (ED) 21-20, sheet 6B, family , NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 4350.
"Washington, County Marriages, 1855-2008," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FLNS-B2R : accessed 6 June 2016), Joseph Lewis Keepers and Mary Irene Oster, 14 Feb 1943; State Archives, Olympia; FHL microfilm 4,136,906.
"United States, Obituaries, American Historical Society of Germans from Russia, 1899-2012," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/QVS3-NFJB : accessed 6 June 2016), Mrs Mary Keepers in entry for Mrs Christina Or Khristina Breckel Oster, 08 Jun 1973; citing Obituary, in ""; American Historical Society of Germans from Russia, Lincoln.
"United States, Obituaries, American Historical Society of Germans from Russia, 1899-2012," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/QVS3-N8K4 : accessed 6 June 2016), Mrs Mary Keepers in entry for John Oster, 08 Jun 1979; citing Obituary, in "Emmons County Record"; American Historical Society of Germans from Russia, Lincoln.
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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: