Christian, Robert R. <br/><br/>
Introduction to logic and sets. 

 - [2nd ed.] 
 - New York :  Blaisdell,  [1965] 
 - Blaisdell book in the pure and applied sciences .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic, Symbolic and mathematical.<br/>Set theory.