Porter, R. I. <br/><br/>
Further mathematics / 
by R. I. Porter 
 - London  :  G. Bell and Sons,  1970 
 - 414 p. :  ill. ;  24  cm. 
<br/><br/><label>ISBN: </label>071351762X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics