Toft, L McKay, A.D.D. <br/><br/>
Practical Mathematics 

 - PITMAN & SONS  London  1960 
 - 504p.  fig. 
 - Volume  I .
<br/><br/><label>Nat. Bib. No.: </label>3297 
<br/><br/><label>Universal Decimal Class. No.: </label>511  / TOF