Visible speech
By: [by] Ralph K. Potter, George A. Kopp [and] Harriet Green Kopp.
Contributors: Kopp, George Adams, 1900- joint author.; Kopp, Harriet C. Green, 1917- joint author.
Edition: [Corr.]
Publisher: Dover Publications
Published: 1966
Place of publication: New York
Language: eng
Number of pages: 439
Subjects: Deaf -- Means of communication.; Speech.; Telephone -- Equipment and supplies.
Notes: Bibliography: p. 428.