Langer, Susanne Katherina Knauth,  1895-1985. <br/><br/>
An introduction to symbolic logic. 

 - 2nd ed. (rev.) 
 - New York,  Dover Publications,  [1953] 
 - 367 p.:  illus.  21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic, Symbolic and mathematical.
<br/><br/><label>LC Class. No.: </label>BC135  / .L35 1953 
<br/><br/><label>Dewey Class. No.: </label>164