01/16/1919 Edison, Thomas Alva to Jervey, Henry
(Daniels, Josephus) Military; Disc phonograph; Sound and acoustics [Photocopy]
[X128C06]  Charles Hummel Collection, Wayne, N.J.: Edison Wartime Research Report No. 6: Phono. Range Finder
[X128C06J; TAEM 0:0]
Courtesy of Charles Hummel.