Lewis, W. D. <br/><br/>
Mathematics make sense  an introduction to propositional algebra for secondary schools 
W. D. Lewis 
 - London  Heinemann  1966 
 - xviii,234p.  ill.  23cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics<br/>Algebra
<br/><br/><label>LC Class. No.: </label>QA93.L4