Statistics for occurrence #1 of “Washington, D. C.” in entry united-states-of-america-pennsylvania of Harper's Encyclopedia of United States History:
...mber.]
Natural gas used as fuel in western counties......1884
Johnstown flood......June 1, 1889
William D. Kelley, born in 1814, the oldest member of the House of Representatives, dies in Washington, D. C. ......Jan. 9, 1890
Proposal of Mr. Carnegie to expend $1,000,000 for a public library in Pittsburg accepted......Feb. 10, 1890
Cyclone at Wilkesbarre and other towns, killing fourteen, injurin...
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† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.