"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MX3C-P96 : accessed 15 May 2016), Frederick Parker in household of Gideon Parker, Gustavus, Trumbull, Ohio, United States; citing family 1640, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"United States Census, 1860", database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MCP9-YJM : accessed 15 May 2016), Fredrick O Parker in entry for Gideon Parker, 1860. Jefferson, Ashtabula, Ohio.
"Ohio Marriages, 1800-1958," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XDX1-LQC : accessed 15 May 2016), Fredrik O. Parker and Sarah E. Angelo, 02 Aug 1863; citing Ashtabula,Ohio, reference ; FHL microfilm 0890265 V. E-F.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MN4V-RCM : accessed 15 May 2016), Fred O Parker, Liberty, Grant, Wisconsin, United States; citing enumeration district ED 112, sheet 210D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1427; FHL microfilm 1,255,427.
"Iowa State Census, 1895," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VTQK-PFY : 17 November 2014), F O Parker, Sioux, Iowa, United States; citing p. 145, 1895, State Historical Society, Des Moines; FHL microfilm 1,022,182.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M9LV-GKZ : accessed 15 May 2016), Frederick Orlando Parker, Reading Township Ireton town, Sioux, Iowa, United States; citing sheet 5B, family 126, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,459.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MG9X-8YV : accessed 15 May 2016), Fredrick O Parker, Reading, Sioux, Iowa, United States; citing enumeration district (ED) ED 154, sheet 2B, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,436.
"Iowa Deaths and Burials, 1850-1990," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XVHN-T9Y : accessed 15 May 2016), Frederick O. Parker, 16 Apr 1917; citing Reading Township, Ireton, Sioux, Iowa, reference p 11 cn 14486-131; FHL microfilm 1,404,845.
"Iowa, Armed Forces Grave Registrations, ca. 1835-1998," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QL2V-T3N3 : 11 February 2019), Fredrick O Parker, 1917; citing Iowa, United States, The State Historical Society of Iowa, Des Moines.; FHL microfilm 2,200,924.
"Iowa, Grand Army of the Republic Membership Records, 1861-1949," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q23N-31DF : 17 March 2018), Frederick O Parker, 1861-1949; citing Iowa, United States, Military Service, State Historical Department, Des Moines; FHL microfilm 1,487,416.
"Iowa, County Marriages, 1838-1934", database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XJCL-2Z6 : accessed 15 May 2016), F.O. Parker in entry for Ernest R. Parker and Stella V. Arthur, 1895.
"Iowa, County Marriages, 1838-1934", database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XJCL-LMN : 8 March 2016), Fred O. Parker in entry for Joseph Henry Pryor and Lena May Parker, 1895.
"Iowa, County Marriages, 1838-1934", database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XJCL-XRF : accessed 15 May 2016), F.O. Parker in entry for Traverse C. Parker and Mary A. Freeman, 1892.
"Iowa, County Marriages, 1838-1934", database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XJCL-KR5 : accessed 15 May 2016), Fred O. Parker in entry for Karl I. Shager and Rose Lee Parker, 1895.
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