Dobinson, John <br/><br/>
O. N. mathematics / 
John Dobinson 
 - Middlesex :  Penguin Education,  1969 
 - 2 v. :  ill. ;  22 cm. 
 - Penguin library of technology .
<br/><br/>Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics