Ellerby, G. <br/><br/>
Graphic and calculas / 
G. Ellerby 
 - London :  Pergamon,  1964 
 - vii, 180 p. :  ill., charts ;  20 cm. 
 - The common wealth and international library ;  19 .
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Statistics--Graphic methods<br/>Graduation--Statistics<br/>Frequency curves
<br/><br/><label>Dewey Class. No.: </label>311.26