03/14/1878 Barker, George Frederick to Edison, Thomas Alva
(Mayer, Alfred Marshall; Bentley, Henry; Adams, James; Preece, William Henry) Newspapers, books, other publications; Telephone; Electromotograph; Cylinder phonograph [Attachment/Enclosure; Marginalia by Edison, Thomas Alva]
[Z005]  Institution of Electrical Engineers Archives, London, UK: William H. Preece Papers
[Z005AU; TAEM 0:0]
Courtesy of the Institution of Electrical Engineers Archives.