Statistics for occurrence #1 of “Washington, D. C.” in chapter 11 of Adam Badeau, Grant in peace: from Appomattox to Mount McGregor, a personal memoir:

...wn headquarters he wrote the famous letter marked Private, which has already been given to the world. I quote the portion referring to Stanton: headquarters armies of the United States, Washington, D. C. , August 1, 1867. His Excellency, A. Johnson, President of the United States: Sir,—I take the liberty of addressing you privately on the subject of the conversation we had this morning, feel...
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