Statistics for occurrence #1 of “O.” in entry hayes-rutherford-birchard of Harper's Encyclopedia of United States History:

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Nineteenth President of the United States, from 1877 to 1881; Republican; born in Delaware, O. , Oct. 4, 1822; graduated at Kenyon College, O., in 1842, and at the Cambridge Law School in 1845; practised law in Cincinnati until 1861, when he became first major, and then colonel, of the 23d Regi...
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