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Elementary principles of radio telegraphy and telephony /
prepared in the Office of the Chief Signal Officer.

APA Citation

United States. Army. Signal Corps. (1921). Elementary principles of radio telegraphy and telephony. 2nd ed. Washington: G.P.O..

MLA Citation

United States. Army. Signal Corps. Elementary Principles of Radio Telegraphy And Telephony. 2nd ed. Washington: G.P.O., 1921.

Warning: These citations may not always be complete (especially for serials).