"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XVDG-JZ9 : 20 May 2016), Parr, 14 May 1891; citing Mahaska, Iowa, United States; county district courts, Iowa; FHL microfilm 979,618.
"Iowa State Census, 1895," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VT31-5FW : 17 November 2014), Charley Parr in household of Byron Parr, Mahaska, Iowa, United States; citing p. 190, 1895, State Historical Society, Des Moines; FHL microfilm 1,022,079.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M925-KWC : 20 January 2015), Charles Parr in household of Byron W Parr, Monroe Township, Mahaska, Iowa, United States; citing sheet 10B, family 229, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,446.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGMK-ZFG : 29 October 2015), Charles M Parr in household of Byron Parr, Monroe, Mahaska, Iowa, United States; citing enumeration district (ED) ED 82, sheet 2A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,425.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M81K-LFW : 14 December 2015), Charles Parr, Monroe, Mahaska, Iowa, United States; citing sheet 5A, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,501.
"Iowa State Census, 1925," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKQ3-1M5V : 23 August 2016), Charles M Parr, Garfield Township, Mahaska, Iowa, United States; citing Iowa State Historical Department, Des Moines; FHL microfilm 1,429,440.
"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZ26-65K : 12 December 2014), Charles M Parr, 1917-1918; citing Mahaska County, Iowa, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,643,152.
"United States World War II Draft Registration Cards, 1942," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKCH-K4PT : 14 April 2016), Charley M Parr, 27 Apr 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.).
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V9KL-WPF : 20 May 2014), Charley Parr, Jan 1969; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).