Leichtetes System zur Erlernung der Morseschrift auf mnemotechnischem Wege / P. Benda Morse-Telegraphen-Lesebuch / F.O. Schönherr Leitfaden zur electrischen Telegraphie mit Ruhestrom : (System Morse) / J. Krämer new morse code manual / A.W. Eley Signal training : all arms : Procedure for morse telegraphy, line telephony, and visual signalling Memorandum voor telegrafisten Morse- en Spelalphabet, Diensttekens, enz. VbbD nr. 2/4/1A. IK 5 How to learn the morse code in thirty minutes and remember it / Ernest Nicholson Methods of operations research / Philip M. Morse and George E. Kimball Operations research : past, present and futue / by Philip M. Morse Instructions for learning international morse characters - USA Voorschrift, Technical Manual, 11-459 Encryptiemachine en vercijferapparaat Typex Mark II Personal Papers in the Albert F.Simpson Historical Research Center / comp. and ed. by Richard E. Morse and Thomas C. Lobenstein
