Allen, Layman E. <br/><br/>
The game of modern logic 

 - New Haven  WFF  1962 
 - viii,223p.  20cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>WFF'N Proof (Game)
<br/><br/><label>LC Class. No.: </label>QA9.A44