Mary Ada Hardcastle
- Born: 22 May 1912, , Bell County, Texas
- Marriage (1): William Claiborne Koen on 17 Nov 1932 in Lampasas, Lampasas County, Texas
- Died: 19 Apr 1996, Brownwood, Brown County, Texas at age 83
- Buried: Caradan Cemetery, Caradan, Mills County, Texas
Mary married William Claiborne Koen on 17 Nov 1932 in Lampasas, Lampasas County, Texas. (William Claiborne Koen was born on 12 Aug 1907 in Caradan, Mills County, Texas, died on 17 Jul 1999 in Brownwood, Brown County, Texas and was buried in Caradan Cemetery, Caradan, Mills County, Texas.)
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