Smoothey , Marion  <br/><br/>
Let's investigate circles : 

 - Marshall :  London ;  1993. 
 - 64 p ;22cm .  01 
 - 2024-07-31 
<br/><br/><label>ISBN: </label>1854354566 
<br/><br/><label>Nat. Bib. No.: </label>0010173 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>SMO 
<br/><br/><label>Universal Decimal Class. No.: </label>510