Training Manuals
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1920s TM s Basic Signal Communication: Training Manual.
- Students Manual-------------------------------------------- No. 20.
- Instructors Guide----- - - - - - - - - - - - - - - - - - - No. 21.
- TM-26 Radio Operator students 1924 File:TM-26.pdf
- TM-27 Radio Operator instructors 1925 File:TM-27 1925.pdf