Statistics for occurrence #1 of “friend Mary” in chapter 8 of William H. Herndon, Jesse William Weik, Herndon's Lincoln: The True Story of a Great Life, Etiam in minimis major, The History and Personal Recollections of Abraham Lincoln by William H. Herndon, for twenty years his friend and Jesse William Weik:

...battle — at least it seems to have afforded him but little encouragement, for on his return to Springfield he immediately indulged in an epistolary effusion stranger than any that preceded it. friend Mary : You will no doubt think it rather strange that I should write you a letter on the same day on which we parted; and I can only account for it by supposing that seeing you lately makes me think of...
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