Langer, Susanne Katherina Knauth. <br/><br/>
An introduction to symbolic logic / 

 - 2d ed. (rev.) 
 - New York:  Dover Publications,  1953. 
 - 367 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic, Symbolic and mathematical.
<br/><br/><label>Dewey Class. No.: </label>164  / LAN