"Iowa, Delayed Birth Records, 1850-1939," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q24X-ZCG5 : accessed 5 April 2017), William C Cook in entry for Owen Price Cook, 23 Nov 1910; citing Spencer, Clay, Iowa, United States, State Historical Society of Iowa, Des Moines; FHL microfilm .
"Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VJP5-XH6 : 20 May 2016), William C Cook in entry for Dale J Cook, 18 Apr 1908; citing Spencer, Clay, Iowa, United States; county district courts, Iowa; FHL microfilm 1,435,000.
"Iowa, Delayed Birth Records, 1850-1939," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q246-17B6 : accessed 5 April 2017), William C Cook in entry for Betty Jean Cook, 16 Sep 1921; citing Spencer, Clay, Iowa, United States, State Historical Society of Iowa, Des Moines; FHL microfilm .
"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZ27-Y3S : 12 December 2014), William Clarence Cook, 1917-1918; citing Clay County, Iowa, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,642,989.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M928-2W1 : accessed 5 April 2017), William C Cook in household of James Cook, Douglas & Hardland Township, Clay, Iowa, United States; citing enumeration district (ED) 27, sheet 5A, family 74, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,424.
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