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Principles of telegraphy, teletypewriter.

APA Citation

United States. Naval Electronic Systems Command. (1967). Principles of telegraphy, teletypewriter. Washington, D.C.: The Command.

United States. Naval Electronic Systems Command. Principles of Telegraphy, Teletypewriter. Washington, D.C.: The Command, 1967.

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