Statistics for occurrence #1 of “Washington, D. C.” in chapter 1 of John G. Nicolay, The Outbreak of Rebellion:

...torical treasures of the Library of Congress — it would have been exceedingly difficult to gather and verify the numerous facts, quotations, names, and dates, which his narrative required. Washington, D. C. , February 26, 1881.
Max. Freq. Min. Freq.
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