Penrose E.T. Au. <br/><br/>
Economics of the international patent system 

 - New York  Johns hopkins press U.S.A.      1951 
 - 247p  cm. 
<br/><br/><label>Standard No.: </label>19,048 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>Z:2673OX, J1