Snyder D Paul <br/><br/>
Modal logic and its applications. 

 - New York     Van Nostrand Reinhold      1971 
 - xiv,325p.  cm. 
<br/><br/><label>Standard No.: </label>45949 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>R193, L1