Mary Harlan Lincoln | |
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| Born | Mary Eunice Harlan September 25, 1846 Iowa City, Iowa, U.S. |
| Died | March 31, 1937 (aged 90) Washington, D.C., U.S. |
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Mary Harlan Lincoln (née Harlan; September 25, 1846 – March 31, 1937) was the daughter of United States Senator James Harlan and the wife of Robert Todd Lincoln.