A rare signed copy of the Emancipation Proclamation has been lent to the National Museum of American History by Washington financier David M. Rubenstein.

The print, one of 48 signed by President Abraham Lincoln, was purchased by Rubenstein a few months ago in a private sale. The museum is displaying the Rubenstein copy in a permanent exhibition called "The American Presidency: A Glorious Burden."

Lincoln artifacts are coveted commodities right now as the country's museums, archives and historical places gear up for the 200th anniversary of Lincoln's birth next month.

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