The classic book "The Art and Skill of Radio Telegraphy" by my friend, Bill Pierpont, N0HFF, who was primarily know for his Ancient Koine Greek scholarship, he was also co-author of the Byzantine Majority Textform with co-author Maurice Robinson, 

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But his second love was Morse Radiotelegraphy!. This book is republished by Robert F. Heytow Memorial Radio Club/K9YA Telegraph. The current 5th revised edition has additional material and images. It’s sold without profit by The Robert F. Heytow Memorial Radio Club, K9YA, through Lulu.com.

Earlier editions are on the above website for free download. 

2nd edition: http://www.tasrt.ca/bookdown.html in English, French, Japanese, Portuguese, Danish, German, and Simplified Chinese.

3rd edition: http://cw.hfradio.org/cw_resources/The_Art_and_Skill_of_Radio_Telegraphy-3rd-edition.pdf
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