Elementary principles of radio telegraphy and telephony
By: prepared in the Office of the Chief Signal Officer
Edition: 2nd ed.
Series: Document / United States. War Dept -- no. 1064; Radio communication pamphlet -- no. 1; Document (United States. War Department) -- no. 1064
Publisher: G.P.O.
Published: 1921
Place of publication: Washington
Language: eng
Number of pages: 79
Subjects: Wireless Telegraph; Radio; Transmitters and transmission
Notes: "April, 1921."