Bush, Clara N., <br/><br/>
Phonetic variation and acoustic distinctive features :  a study of four general American fricatives / 
Clara N. Bush. 
 - 161 pages :  illustrations ;  27 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language--Phonetics.--United States<br/>English language--Consenants.--United States