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- [S620] 1900 Census Texas, Callahan Co., Texas, Callahan Co., (www.ancestry.com: National Archives and Records Administration, n.d.), T623, Precinct 3, enumeration district (ED) 17, sheet 13B, p. 26, dwelling 230, family 234, John C. Cook, accessed 25 May 2011 (Reliability: 3), 25 May 2011.
- [S612] 1910 Census Texas, Callahan Co., Texas, Callahan Co., (www.ancestry.com: National Archives and Records Administration, n.d.), T624, Putnam, enumeration district (ED) 19, sheet 2B, p. 4, dwelling 30, family 33, James C. Cook, accessed 26 May 2011 (Reliability: 4), 26 May 2011.
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