Mary Williamson
Her death date is confirmed by the inscription on her gravestone and the Utah State History Cemeteries and Burials Database.
The obituary of her son Thomas states that he came to Utah with his parents at the age of 3 years, and his death certificate states of her he had lived in Springville Utah for 75 years, making his arrival in 1854.
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Mary Williamson (1817 - 1891) Profile