Statistics for occurrence #1 of “Washington, D. C.” in chapter 121 of Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 6.:

...at power, and intended for iron-clads. Very respectfully, your obedient servant, S. F. Du Pont, Rear-Admiral Com'g South-Atlantic Blockading Squadron. Hon. Gideon Welles, Secretary of the Navy, Washington, D. C.
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