Dewey, Godfrey 1887-.
Relative frequency of English speech sounds /
Godfrey Dewey 
. - Cambridge : Harvard University Press, London : Sir Isaac Pitman & Sons, Ltd.,  [s. a.] 
. - xii, 186 p.  tab.  22 cm. 
 - (Harvard studies in education  ; v. 4 )
<br/><br/> Репринтне видання 1923 р..