Exner, Robert M. <br/><br/>
Logic in elementary mathematics / 
by Robert M. Exner and Myron F. Rosskopf 
 - New York :  McGraw-Hill,  1959 
 - 274 p. :  ill. ;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Philosophy<br/>Logic, Symbolic and mathematical