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History. Washington D.C.: Gallaudet University Press. p. 197. ISBN 978-1-56368-121-9. Markides, Andreas (1983). The Speech of Hearing-impaired Children...

Washington, D.C.: Gallaudet University Press. pp. 30–31, 152–153. ISBN 978-1-56368-121-9. Jay, Michelle (January 2, 2020). "Alexander Graham Bell - Helpful...