Johnson, Leonard Gustave,  1918-, <br/><br/>
Theory and technique of variation research. 
 Variation research. 

 - 105 páginas 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Estadística<br/>Métodos gráficos
<br/><br/><label>LC Class. No.: </label>TA161  / J6