As one of the many events commemorating the 200th anniversary of the sale of Thomas Jefferson's library to the Library of Congress, Mark Dimunation gives the history behind this historic event. Speaker Biography: Mark Dimunation is chief of the Rare Book and Special Collections Division at the Library of Congress. For transcript, captions, and more information, visit www.loc.gov/today/cyberlc/feature_wdesc.php?rec=6851