Statistics for occurrence #1 of “Mr. Lowe” in entry united-states-of-america-district-of-columbia of Harper's Encyclopedia of United States History:

...ence of five commissioners from each State assembles at Washington......Feb. 4, 1861 Balloon ascension for military purposes made at Washington, and first telegraph message from a balloon sent by Mr. Lowe to President Lincoln......June 18, 1861 Congress emancipates all slaves, to be valued by commissioners and paid for at a maximum of $300......April 16, 1862 Collegiate department of the Colum...
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