Tucked into the pages of an antique book, our contributor from Osceola, Indiana found what he thinks may be a letter written by Clara Barton, founder of the American Red Cross.More than 30 years ago, while tearing the aluminum roofing from a farm house, a Chicago man discovered an oddly carved piece of wood in the dark recesses of the attic. Working beside a rural airstrip, an Illinois man dug up an intriguing find: an eight-foot long wooden airplane propeller. A little research online made him believe that his propeller might be from a TDR-1 plane, a pioneering U.S. drone plane from World War II.