International Coresponcence School <br/><br/>
Graphs 

 - 5th ed 
 - auth., London  c1957 
 - 48p 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>Maths.
<br/><br/><label>Dewey Class. No.: </label>511.5 I.C.S.