TY  - BOOK
TI  - Learning the radiotelegraph code / 
U1  - 621.3842 
PY  - 1961///
CY  - Connecticut
PB  - The American Radio Relay League, 
KW  - Engineering
KW  - Radio broadcasting
KW  - Radio frequency allocation
KW  - Radio equipment
KW  - Telecommunication codes
ER  -