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