Walker, W. E. <br/><br/>
Graded examples in graphs and calculus for ordinary level students / 
by W.E. Walker and E.G. Shalders ... 
 - London ;  Glasgow :  Blackie and Son,  [1967]. 
 - viii, 112 p. :  fig., couv., ill. ;  19 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematic