Potter, Ralph Kimball, 1894-
Visible speech [by] Ralph K. Potter, George A. Kopp [and] Harriet C. Green. - 1st ed. - New York, D. Van Nostrand Co., 1947. - xvi, 441 p. : illus., diagrs. ; 28 cm. - The Bell Telephone Laboratories series . - Bell Telephone Laboratories series. .
Bibliography: p. 430.
47005168
Deaf--Means of communication.
Speech.
Telephone--Equipment and supplies.
TK6500 / .P65
414 / POV
Visible speech [by] Ralph K. Potter, George A. Kopp [and] Harriet C. Green. - 1st ed. - New York, D. Van Nostrand Co., 1947. - xvi, 441 p. : illus., diagrs. ; 28 cm. - The Bell Telephone Laboratories series . - Bell Telephone Laboratories series. .
Bibliography: p. 430.
47005168
Deaf--Means of communication.
Speech.
Telephone--Equipment and supplies.
TK6500 / .P65
414 / POV