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- [S75] O'Brien, Charles H. (I2114): 1900 US Census, (www.ancestry.com (2004): National Archives and Records Administration micropublication T623, roll 1629, enumeration district (ED) 59, sheet 9B, page 179B, line 92, dwelling 161, family 161; image accessed 1/5/2009.), 1900.TX.Eastlant.Precinct 5.59.19.
- [S76] O'Brien, Charles H. (I2114): 1910 US Census, (www.ancestry.com (2006): National Archives and Records Administration micropublication T624, roll 1547, enumeration district (ED) 48, sheet 13B, page 223B, line 82, dwelling 303, family 309; image accessed 1/5/2009.), 1910.TX.Eastland.Cisco.48.26.
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