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- [S159] Auswanderer-Datenbank Schwarzburg-Rudolstadt und Schwarzburg-Sondershausen, Id-Nr. 0157.
- [S188] United States Census, 1910, https://www.familysearch.org/ark:/61903/1:1:MPNM-FYD.
- [S37] United States Census, 1900, https://www.familysearch.org/ark:/61903/1:1:M9ZW-5JZ.
- [S188] United States Census, 1910.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MPNM-FYD : accessed 22 March 2018), Oscar Seel in household of Caroline Seel, Wheeling Ward 6, Ohio, West Virginia, United States; citing enumeration district (ED) ED 132, sheet 4B, family 89, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1692; FHL microfilm 1,375,705.
- [S180] United States World War I Draft Registration Cards, 1917-1918.
"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K8Q4-1PQ : 13 March 2018), Oscar Hugo Seel, 1917-1918; citing Wheeling County, West Virginia, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,993,025.
- [S189] West Virginia Deaths, 1804-1999.
"West Virginia Deaths, 1804-1999," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NM8B-Z48 : 10 March 2018), Oscar Hugo Seel, 29 Jul 1937; citing Ohio, West Virginia, County Records, 10886, county courthouses, West Virginia; FHL microfilm 1,983,278.
- [S189] West Virginia Deaths, 1804-1999.
"West Virginia Deaths, 1804-1999," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N9HJ-PBG : 10 March 2018), Oscar Hugo Seel, 29 Jul 1937; citing Wheeling, Ohio, West Virginia, County Records, v 81 p, county courthouses, West Virginia; FHL microfilm 857,615.
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