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Here is a technical work on delayed speech development and the practical therapy for overcoming it used in the Hill-Young School of Speech. In the therapy, interest is centered on speech movements and word patterns. The appendix provides numerous illustrations showing what is meant by this technic.
Children with Delayed or Defective Speech: Motor-Kinesthetic Factors in Their Training. JAMA. 1939;113(9):883. doi:10.1001/jama.1939.02800340153038