General phonetics / R-M. S Heffner ; with a foreword by W. F. Twaddell. Heffner, R.-M. S. (Roe-Merrill Secrist), 1892- Phonetics P221 .H4 414 HEG Madison : University of Wisconsin Press, 1952. 1952. 1952 Text xvii, 253 p. : eng