EDISON, THOMAS A. Autograph letter signed ("TAE") to "Darling XXXXX Billy Sweetness Edison" [Mina Edison], reassuring her of her intelligence. N.p., n.d. 2 pages, 4to, some light dampstaining. "... Billy Darling don't get so despondent about yourself - there isn't one woman in 20,000 that is really so smart as yourself... your lack of self confidence is the trouble, getting blue over such things is rotten nonsense..." With a 4-line initial-signed postcript at end.