"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MDR8-98P : accessed 01 Apr 2014), John W Decoursey, Noble, Noble, Ohio, United States; citing sheet 3A, family 51, NARA microfilm publication T625, FHL microfilm 1821424.
"Ohio, County Marriages, 1789-1994," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XDPN-G61 : accessed 01 Apr 2014), John W Decorsey and Eva May Spicer, 25 Jul 1917; citing Noble, Ohio, United States, reference 821; FHL microfilm 2296742.
"Ohio, County Marriages, 1789-1994," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X825-Z2H : accessed 01 Apr 2014), John W. Decoursey and Anna Delong, 16 Apr 1902; citing Tuscarawas, Ohio, United States, reference n24672 p266; FHL microfilm 890368.
"United States World War II Draft Registration Cards, 1942," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X5CS-PJ8 : accessed 02 Apr 2014), John William De Coursey, 1942; citing ARC identifier 623234, National Archives and Records Administration, Washington D.C.; FHL microfilm 2372626.
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DNA Connections
It may be possible to confirm family relationships with John William by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with John William: