Statistics for occurrence #1 of “Washington, D. C.” in alphabetic letter pos=23, entry group 6, entry wharton-francis of Harper's Encyclopedia of United States History:

...Polity, and Apologetics in the Cambridge Episcopal Seminary in 1866; and became editor of the Revolutionary diplomatic correspondence of the United States by an act of Congress, in 1888. He died in Washington, D. C. , Feb. 21, 1889.
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Max. Freq. Min. Freq.
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