Morse code

National Archives and Records Administration: INTERNATIONAL MORSE CODE, HAND SENDING, from the Department of Defense. Department of the Army. Office of the Chief Signal Officer. (09/18/1947 - 02/28/1964). ARC Identifier 36813 / Local Identifier 111-TF-3697. PRINCIPLES AND BASIC TECHNIQUE FOR GOOD, RHYTHMIC SENDING 0F MORSE CODE BY OPERATING THE HAND KEY.


 * Morse Code on Wikipedia.
 * http://www.fists.org/ - International Morse Code Preservation Society
 * http://www.morsecode.nl/ - The Ultimate Morse Code Website