<p>A bust of Helen Keller, scorched and covered in World Trade Center dust, on display in New York on June 24.</p>
July 31, 2011
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July 31, 2011 9 p.m.
Mystery surrounds loss of records, art on 9/11
Historic artifacts missing since World Trade Center attack
NEW YORK - Letters written by Helen Keller. Forty-thousand photographic negatives of John F. Kennedy taken by the president's personal cameraman. Sculptures by Alexander Calder and Auguste Rodin. The 1921 agreement that created the agency that built the World Trade Center.