Statistics for occurrence #1 of “Professor Mahan” in chapter 5 of Varina Davis, Jefferson Davis: Ex-President of the Confederate States of America, A Memoir by his Wife, Volume 1:

... and duty. During all his life he remembered his old companions at West Point, and wrote many loving words to General Crafts, J. Wright, his old and dear friend Sidney Burbank, Professor Church, Professor Mahan , and others, who had been friendly or kind to him there.
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