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- [S37] United States Census, 1900, https://www.familysearch.org/ark:/61903/1:1:M9ZW-5JH.
- [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:K8Q4-1P7 : 13 March 2018), Otto 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.
- [S122] United States World War II Draft Registration Cards, 1942, database with images, FamilySearch.
"United States World War II Draft Registration Cards, 1942," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X5JS-2QM : 9 March 2018), Otto Emil Seel, 1942; citing NARA microfilm publication M1936, M1937, M1939, M1951, M1962, M1964, M1986, M2090, and M2097 (Washington D.C.: National Archives and Records Administration, n.d.).
- [S189] West Virginia Deaths, 1804-1999.
"West Virginia Deaths, 1804-1999," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N9HP-YK4 : 10 March 2018), Otto Emil Ferdinand Armien Seel, 14 Jul 1946; citing Wheeling (Rural), Richland Dist, Ohio, West Virginia, County Records, v 99 cn 596, county courthouses, West Virginia; FHL microfilm 857,627.
- [S360] West Virginia Marriages, 1780-1970.
"West Virginia Marriages, 1780-1970," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FBSG-NLS : 11 February 2018), Otto Seel and Mary Miller, 1901; citing Ohio, West Virginia, United States, , county clerks, West Virginia; FHL microfilm 863,808.
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