Statistics for occurrence #1 of “Washington, D. C.” in chapter 10, page 142 of William A. Crafts, Life of Ulysses S. Grant: His Boyhood, Campaigns, and Services, Military and Civil.:

...ed to him, he addressed to the President the following letter, which shows his respect for law, his fidelity to principle, and his honest independence. headquarters armies of the United States, Washington, D. C. , August 1, 1867. Sir: I take the liberty of addressing you privately on the subject of the conversation we had this morning, feeling, as I do, the great danger to the welfare of the country shoul...
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