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A mnemonic device for memorizing the International Morse Code. by Alfred Eli Johns · Bookplated
A mnemonic device for memorizing the International Morse Code.
A mnemonic device for memorizing the International Morse Code.
1943
12 pages
Written by
Alfred Eli Johns
A mnemonic device for memorizing the International Morse Code.
Alfred Eli Johns
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Mnemonics
Morse code
Signals and signalling