Walker, Helen Mary,  1891- <br/><br/>
Elementary statistical methods / 
Helen Mary Walker 
 - Rev. ed. 
 - New York :  Holt Rinehart and Winston,  1958 
 - 302 p. :  ill. ;  25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Statistics
<br/><br/><label>Dewey Class. No.: </label>311.2