https://archive.org/details/morse-code-teaching-research/KochDissertation/mode/2up
Koch Morse Code Teaching Research : Conder, Robert, K4RLC : Free Download, Borrow, and Streaming :...
Koch Morse Code Teaching Researchby Robert Conder, K4RLC, a board certified Neuropsychologist and applied neuroscientist.Published with permission, copyright...