Visible speech Potter, Ralph Kimball 1894- creator Kopp, George Adams 1900- joint author. Green, Harriet C. 1917- joint author. text bibliography nyu New York D. Van Nostrand Co. 1947 1st ed. monographic eng
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xvi, 441 p. : illus., diagrs. ; 28 cm. [by] Ralph K. Potter, George A. Kopp [and] Harriet C. Green. Bibliography: p. 430. Deaf Means of communication Speech Telephone Equipment and supplies TK6500 .P65 414 POV Bell Telephone Laboratories series 47005168 DLC 730727 20140817181155.0 6006248