Mary Carson Breckinridge (1881–1965), founder of the Frontier Nursing Service
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Mary Cyrene Burch Breckinridge (1826–1907), Second Lady of the United States; wife of John C. Breckinridge
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She used her middle name, Marvin, both professionally and personally to distinguish herself from her cousin Mary Breckinridge (founder of the Frontier Nursing Service) and to avoid the prejudice against women prevalent at the time.