The National Archives says a longtime Abraham Lincoln researcher has confessed to tampering with a presidential pardon of a Civil War military deserter so he could claim credit for finding a document of historical significance.

The Archives said Monday that historian Thomas P. Lowry, 78, has acknowledged that he used a fountain pen with special ink to change the date on a presidential pardon issued by Lincoln to a military deserter, making it appear that Lowry had uncovered a document of historical significance.

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