Elderton, William Palin , Sir Johnson, Norman Lloyd , Sir <br/><br/>
Systems of frequency curves 
[by] William Palin Elderton and Norman Lloyd Johnson 
 -  Cambridge U.P. London  1969  1969 
 - viii, 216 p. ; 24 cm. 
<br/><br/> Based on the 4th ed. of Elderton's Frequency curves and correlation  Bibliography: p. 202-205 
<br/><br/><label>ISBN: </label>0521073693 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Frequency curves--QA
<br/><br/><label>LC Class. No.: </label>QA273.E5 1969