Potter R K <br/><br/>
Visible speech 

 -  1947 
<br/><br/><label>Standard No.: </label>50,691 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>LINGUISTICS
<br/><br/><label>Dewey Class. No.: </label>P11,11, H7