Von Wright Georg H <br/><br/>
Essay in modal logic 

 -  1951 
 - Studies in logic and the foundations of mathematics , ed by L E J Brouwer etc.; 1 .
<br/><br/><label>Standard No.: </label>67,218 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>R1N3, J11