These letters are from 1887, 1924, and 1929. Included is a December1887 letter from Caroline Victor to Mina Miller Edison about deafness, with a handwritten reply by Edison that the condition has its compensations. A January 1924 letter from Edison to motion picture executive George Kleine relates to non-inflammable film. Also included is a June 1929 letter from Edison to U.S. Postmaster General Walter F. Brown thanking him for issuing a stamp to commemorate the invention of the incandescent lamp