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Morse Code for Radio Amateurs
Roger Cooke
出版Radio Society of Great Britain, 2016
ISBN19101931949781910193198
URLhttp://books.google.com.hk/books?id=OhhMAQAACAAJ&hl=&source=gbs_api
註釋Learn or improve your Morse code with this guide. CD includes software and MP3 files to help you practise Morse code.