1. Letter of James F. Gregory, Lieut. Colonel and A.D.C., to Lieut. General P.H. Sheridan, concerning telegraphic code Author(s): Gregory, James F. (James Fingal), 1843-1897, author Publication: Washington : Government Printing Office, 1886 Subject(s): TelecommunicationsMilitary ScienceUnited StatesUnited States. Army.
