Visible speech [by] Ralph K. Potter, George A. Kopp [and] Harriet Green Kopp.
Subtitle: [Corr.]
Contributors: Kopp, George Adams, 1900-,; Kopp, Harriet C. Green, 1917-,
Publisher: Dover Publications
Published: 1966
Place of publication: New York
Language: eng
Number of pages: 439
Subjects: Deaf -- Means of communication; Speech; Telephone -- Apparatus and supplies