Ehlers, Henry J. <br/><br/>
Logic  modern and traditional / 
Henry J. Ehlers 
 - Columbus, Ohio :  Charles E. Merrill,  1976 
 - 245 p. :  ill. ;  26 cm. 
<br/><br/><label>ISBN: </label>0675086760 
<br/><br/><label>LCCN: </label>75-16936 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic