Roethel, Louis F. <br/><br/>
Logic, sets & numbers / 
by Louis F. Roethel. 
 - 2nd  ed. 
 - Belmont, Calif. :  Wadsworth,  c1976. 
 - viii, 351  p. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0534004911 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--1961.
<br/><br/><label>LC Class. No.: </label>QA39.2   / .R6