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- William J. and Tacy P. Hallowell to Mary Hallowell
- A letter from William J. and Tacy P. Hallowell of Horsham, PA to Mary Hallowell, Woman's Medical College, 1881. Each parent writes individually to Mary in the letter.
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- William J., and Tacy P. Hallowell to Mary Hallowell
- Letter to Mary P. Hallowell (Woman's Medical College of Pennsylvania 1881) from her parents.