Two Illinois State University math professors recently authenticated that two math-notebook pages belonged to Abraham Lincoln. The pages were found in the archives of Harvard's Houghton Library and were part of a math workbook, called a ciphering book, that Lincoln worked on in his youth. The ciphering book is the oldest known Lincoln manuscript. Nerida Ellerton and Ken Clements, the professors wh... [more]
Blog Posts tagged "abraham lincoln"
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