Bird, J.O <br/><br/>
Mathematics for electrical technicians level <4=four> and <5=five> 

 - London  Longman Group Ltd.  1981 
 - 384p 
 -  Longman technician series in mathematics and sciences  Browning, D.R .
<br/><br/><label>Universal Decimal Class. No.: </label>51  / : 621.3 BIR.81